Adding Azure unittests

[shahidee44]

Description

• Adding Missing unittests for Azure Backend
• Added QiskitQPUBackend with Azure Device Exception messages check unittest
• Added remote qubit overflow with Azure Device unittest
• Added Manual Mode check for Azure Backend.
• Updated Old unittest with Azure backend
• Changed Exception Messages in Qiskit Backend

Checklist

• [ ] I have performed a self-review of my code.
• [ ] I have commented my code and used numpy-style docstrings
• [ ] I have made corresponding updates to the documentation.
• [ ] My changes generate no new warnings
• [ ] I have added/updated tests to make sure bugfix/feature works.
• [ ] New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Name the new unit-tests that you have added along with this change.

[codecov[bot]]

Codecov Report

Merging #190 (ddc2712) into dev (d22617e) will decrease coverage by 0.86%. The diff coverage is 79.46%.

@@            Coverage Diff             @@
##              dev     #190      +/-   ##
==========================================
- Coverage   88.78%   87.93%   -0.86%     
==========================================
  Files          32       32              
  Lines        5769     5858      +89     
==========================================
+ Hits         5122     5151      +29     
- Misses        647      707      +60     

Impacted Files	Coverage Δ
tests/test_aws_managed_jobs.py	67.92% <0.00%> (ø)
tests/test_workflows.py	99.49% <ø> (+<0.01%)	:arrow_up:
tests/test_qpu_braket.py	10.23% <3.33%> (ø)
tests/test_qpu_qiskit.py	13.11% <8.69%> (+1.25%)	:arrow_up:
tests/test_qpu_devices.py	37.50% <15.78%> (ø)
tests/test_backends.py	53.03% <41.17%> (+0.57%)	:arrow_up:
tests/test_circuit_routing.py	71.98% <70.78%> (ø)
tests/test_optimizers.py	99.49% <98.43%> (ø)
tests/test_problems.py	99.16% <98.58%> (ø)
tests/test_results.py	99.57% <99.11%> (-0.43%)	:arrow_down:
... and 19 more

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