fix(ci): py linter only runs on added or modified files (not on deleted)

[nstng]

Summary

#12291 refactored the changed files mechanics to using dorny/paths-filter filesChanged logic. The original --diff-filter=ACMRT was not taken over correctly. This causes python-workflow.yml to fail if a py file is deleted. See, e.g., https://github.com/magma/magma/runs/6195817220?check_suite_focus=true.

Solution Here

Use dorny/paths-filter with addition added|modified filter.

Test Plan

CI, see https://github.com/magma/magma/actions/runs/2238242192 for a run where a py file was deleted (dropped this test commit afterwards).

Additional Information

• This change is backwards-breaking

[github-actions]

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[github-actions]

feg-workflow

    2 files  202 suites   38s ⏱️
371 tests 371 ✔️ 0 💤 0 ❌
385 runs  385 ✔️ 0 💤 0 ❌

Results for commit ebbe7fb.

[maxhbr]

looks good!

[themarwhal]

nice catch and thanks for the fix!