refactor: codeflare sdk unit tests

[Bobbins228]

sort unit tests into individual files and made minor enhancements

Issue link

Closes: RHOAIENG-13847

What changes have been made

• Refactored unit tests into separate files from unit_test.py
• Updated get_ray_obj and get_aw_obj related helper functions (No more full RayCluster/AppWrapper yamls in a test file!!!)
• Made minor enhancements to pre-existing unit tests
• Merged all ClusterConfiguration related tests into one test that tests all parameters (instead of multiple smaller tests that test 1 or 2)
• removed demo-tests.py and func-tests.py (I think these were initial test files which we have never used)

Verification steps

• Create a shell with poetry shell
• Install the CodeFlare SDK -> poetry install --with test,docs
• Run all of the tests using coverage run -m --source=src pytest src/codeflare_sdk --ignore=src/codeflare_sdk/common/utils/unit_test_support.py
• Check coverage with coverage report or coverage report -m | tail -1 | tail -c 4

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[codecov]

Codecov Report

Attention: Patch coverage is 97.46479% with 27 lines in your changes missing coverage. Please review.

Project coverage is 93.99%. Comparing base (bff13a5) to head (3d5a99d).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/codeflare_sdk/common/utils/unit_test_support.py	89.05%	15 Missing ⚠️
src/codeflare_sdk/ray/cluster/test_cluster.py	97.14%	6 Missing ⚠️
src/codeflare_sdk/ray/cluster/test_pretty_print.py	87.23%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #702      +/-   ##
==========================================
+ Coverage   91.30%   93.99%   +2.69%     
==========================================
  Files          23       36      +13     
  Lines        1299     2364    +1065     
==========================================
+ Hits         1186     2222    +1036     
- Misses        113      142      +29     

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[openshift-ci]

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