lowercase source arn before listing trial components

Issue #, if available: internal customer ticket
Description of changes: near term mitigation for arn casing changes on backend which are currently causing Tracker.load to fail when a training job has upper case.
Testing done: locally `tox -e p38 -- -m 'not docker'
❯ tox -e py38 -- -m 'not docker'
GLOB sdist-make: /Users/danabens/workplace/github/aws/sagemaker-experiments/setup.py
py38 inst-nodeps: /Users/danabens/workplace/github/aws/sagemaker-experiments/.tox/.tmp/package/1/sagemaker-experiments-0.1.40.dev3+g954d731.zip
py38 installed: atomicwrites==1.4.1,attrs==22.1.0,boto3==1.26.16,botocore==1.29.16,certifi==2022.9.24,charset-normalizer==2.1.1,coverage==6.5.0,distlib==0.3.6,docker==6.0.1,exceptiongroup==1.0.4,execnet==1.9.0,filelock==3.8.0,flake8==6.0.0,idna==3.4,importlib-metadata==0.23,iniconfig==1.1.1,jmespath==1.0.1,joblib==1.2.0,mccabe==0.7.0,more-itertools==9.0.0,numpy==1.23.5,packaging==21.3,pandas==1.5.2,platformdirs==2.5.4,pluggy==0.13.1,py==1.11.0,pycodestyle==2.10.0,pyflakes==3.0.0,pyparsing==3.0.9,pytest==4.4.1,pytest-cov==2.9.0,pytest-cover==3.0.0,pytest-coverage==0.0,pytest-forked==1.4.0,pytest-rerunfailures==8.0,pytest-xdist==1.34.0,python-dateutil==2.8.2,pytz==2022.6,requests==2.28.1,s3transfer==0.6.0,sagemaker-experiments @ file:///Users/danabens/workplace/github/aws/sagemaker-experiments/.tox/.tmp/package/1/sagemaker-experiments-0.1.40.dev3%2Bg954d731.zip,scikit-learn==0.24.2,scipy==1.9.3,six==1.16.0,sklearn==0.0.post1,threadpoolctl==3.1.0,toml==0.10.2,tomli==2.0.1,tox==3.13.1,urllib3==1.26.12,virtualenv==20.16.7,websocket-client==1.4.2,zipp==3.10.0
py38 run-test-pre: PYTHONHASHSEED='2266544003'
py38 run-test: commands[0] | coverage run --source smexperiments -m pytest -m 'not docker'
=================================================================================================================================================== test session starts ====================================================================================================================================================
platform darwin -- Python 3.8.13, pytest-4.4.1, py-1.11.0, pluggy-0.13.1
cachedir: .tox/py38/.pytest_cache
rootdir: /Users/danabens/workplace/github/aws/sagemaker-experiments, inifile: pytest.ini
plugins: cov-2.9.0, forked-1.4.0, rerunfailures-8.0, xdist-1.34.0
collected 194 items / 1 deselected / 193 selected

tests/integ/test_experiment.py ...........                                                                                                                                                                                                                                                                           [  5%]
tests/integ/test_search_expression.py .s.                                                                                                                                                                                                                                                                            [  7%]
tests/integ/test_track_from_processing_job.py s                                                                                                                                                                                                                                                                      [  7%]
tests/integ/test_track_from_training_job.py s                                                                                                                                                                                                                                                                        [  8%]
tests/integ/test_tracker.py ..........                                                                                                                                                                                                                                                                               [ 13%]
tests/integ/test_training_job.py s                                                                                                                                                                                                                                                                                   [ 13%]
tests/integ/test_trial.py ........                                                                                                                                                                                                                                                                                   [ 18%]
tests/integ/test_trial_component.py ..........                                                                                                                                                                                                                                                                       [ 23%]
tests/unit/test_api_types.py ...                                                                                                                                                                                                                                                                                     [ 24%]
tests/unit/test_base_types.py ............                                                                                                                                                                                                                                                                           [ 31%]
tests/unit/test_environment.py .....                                                                                                                                                                                                                                                                                 [ 33%]
tests/unit/test_experiment.py .................                                                                                                                                                                                                                                                                      [ 42%]
tests/unit/test_list_trial_components_from_trial.py ......                                                                                                                                                                                                                                                           [ 45%]
tests/unit/test_metrics.py ..........                                                                                                                                                                                                                                                                                [ 50%]
tests/unit/test_search_expression.py .....                                                                                                                                                                                                                                                                           [ 53%]
tests/unit/test_tracker.py .....................................................                                                                                                                                                                                                                                     [ 80%]
tests/unit/test_training_job.py .                                                                                                                                                                                                                                                                                    [ 81%]
tests/unit/test_trial.py ...................                                                                                                                                                                                                                                                                         [ 91%]
tests/unit/test_trial_component.py ............                                                                                                                                                                                                                                                                      [ 97%]
tests/unit/test_utils.py .....                                                                                                                                                                                                                                                                                       [100%]

===================================================================================================================================================== warnings summary =====================================================================================================================================================
tests/unit/test_tracker.py::test_log_pr_curve
  /Users/danabens/workplace/github/aws/sagemaker-experiments/.tox/py38/lib/python3.8/site-packages/sklearn/utils/multiclass.py:14: DeprecationWarning: Please use `spmatrix` from the `scipy.sparse` namespace, the `scipy.sparse.base` namespace is deprecated.
    from scipy.sparse.base import spmatrix

-- Docs: https://docs.pytest.org/en/latest/warnings.html
============================================================================================================================ 189 passed, 4 skipped, 1 deselected, 1 warnings in 134.36 seconds =============================================================================================================================
py38 run-test: commands[1] | coverage report --fail-under=95
Name                                                                       Stmts   Miss  Cover
----------------------------------------------------------------------------------------------
.tox/py38/lib/python3.8/site-packages/smexperiments/__init__.py                2      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/_base_types.py            95      7    93%
.tox/py38/lib/python3.8/site-packages/smexperiments/_boto_functions.py        34      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/_environment.py           36      1    97%
.tox/py38/lib/python3.8/site-packages/smexperiments/_utils.py                 41      2    95%
.tox/py38/lib/python3.8/site-packages/smexperiments/api_types.py             149      4    97%
.tox/py38/lib/python3.8/site-packages/smexperiments/experiment.py             57      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/metrics.py                79      4    95%
.tox/py38/lib/python3.8/site-packages/smexperiments/search_expression.py      47      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/tracker.py               291     12    96%
.tox/py38/lib/python3.8/site-packages/smexperiments/training_job.py            6      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/trial.py                  75      0   100%
.tox/py38/lib/python3.8/site-packages/smexperiments/trial_component.py        63      1    98%
----------------------------------------------------------------------------------------------
TOTAL                                                                        975     31    97%
_________________________________________________________________________________________________________________________________________________________ summary __________________________________________________________________________________________________________________________________________________________
  py38: commands succeeded
  congratulations :)
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aws / sagemaker-experiments
