Update test workflow with file path filtering

[AlexanderGetka-cbica]

Fixes #ISSUE_NUMBER

Proposed Changes

• Add path-ignore filtering to the test workflow so that it doesn't run only on doc changes. Keeping it minimal because other files (e.g. MANIFEST.in) could actually end up affecting the build.
• ( This is a draft because I need to check how this works with codecov).

Checklist

• [x] I have read the CONTRIBUTING guide
• [x] My PR is based from the current GaNDLF master
• [x] Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change
• [x] Function/class source code documentation added/updated
• [x] Code has been blacked for style consistency
• [x] If applicable, version information has been updated in GANDLF/version.py
• [x] If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file
• [x] Usage documentation has been updated, if appropriate
• [x] History has been updated, if appropriate
• [x] Tests added or modified to cover the changes; if coverage is reduced, please give explanation
• [x] If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3,4]

[codecov[bot]]

Codecov Report

Merging #473 (7a17fe7) into master (f4c4752) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #473      +/-   ##
==========================================
- Coverage   92.53%   92.51%   -0.02%     
==========================================
  Files         105      105              
  Lines        6417     6417              
==========================================
- Hits         5938     5937       -1     
- Misses        479      480       +1     

Flag	Coverage Δ
unittests	92.51% <ø> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...NDLF/data/preprocessing/template_matching/utils.py	95.34% <0.00%> (-2.33%)	:arrow_down:

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[sarthakpati]

Placed PR in draft pending final logic completion.

[AlexanderGetka-cbica]

@sarthakpati @Geeks-Sid This is ready for review, after some testing on my end regarding other CI services. Everything else should run when triggered this way. As a general rule, methods for bypassing the tests should be kept to a minimum.

Do note that this still does run what is effectively build test in the form of the Docker "edge" builds.