Disable gradient tape profiling tests

[adimux]

Description of changes:

Tests related to profiling using gradient tape are failing and blocking the TF2.7 release. Since this feature has never been released, we can safely disable the tests, until we make a decision about supporting this feature.

Style and formatting:

I have run pre-commit install && pre-commit run --all-files to ensure that auto-formatting happens with every commit.

Issue number, if available

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #525 (423c4c2) into master (b4dd4c1) will decrease coverage by 6.42%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   77.60%   71.18%   -6.43%     
==========================================
  Files         127      117      -10     
  Lines       11111    10585     -526     
==========================================
- Hits         8623     7535    -1088     
- Misses       2488     3050     +562     

Impacted Files	Coverage Δ
...debug/profiler/analysis/notebook_utils/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/mxnet/utils.py	18.75% <0.00%> (-59.38%)	:arrow_down:
...g/profiler/analysis/notebook_utils/training_job.py	0.00% <0.00%> (-50.00%)	:arrow_down:
smdebug/xgboost/utils.py	0.00% <0.00%> (-41.54%)	:arrow_down:
smdebug/xgboost/__init__.py	0.00% <0.00%> (-40.00%)	:arrow_down:
smdebug/mxnet/graph.py	22.58% <0.00%> (-37.10%)	:arrow_down:
smdebug/pytorch/utils.py	45.23% <0.00%> (-35.72%)	:arrow_down:
smdebug/trials/profiler_trial.py	24.61% <0.00%> (-32.31%)	:arrow_down:
smdebug/tensorflow/keras.py	57.42% <0.00%> (-30.26%)	:arrow_down:
smdebug/rules/action/stop_training_action.py	54.68% <0.00%> (-26.57%)	:arrow_down:
... and 56 more

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[adimux]

xgboost tests are failing in the nightly build of sagemaker-debugger, so this PR is ok to merge

[Roshrini]

LGTM. Thanks