Translate annotation line numbers from merge to head

[samestep]

This PR

• adds a tools/translate_annotations.py script that
  • parses annotations into JSON using the regexes that we were previously passing to pytorch/add-annotations-github-action and
  • uses git diff-index to translate the line numbers for those annotations from the PR merge onto the PR head, since (as of Clarify and document commit choice for CI jobs #54967) we now run CI on the former instead of the latter;
• modifies the flake8-py3 and clang-tidy jobs to use that script and thus upload JSON in their artifacts instead of raw text; and
• modifies the "Add annotations" workflow to specify mode: json to allow it to use those preprocessed annotations.

Depends on pytorch/add-annotations-github-action#18.

Test plan:

You can run the unit tests with this command:

python tools/test/test_translate_annotations.py

I also tested the entire system together in my personal sandbox repo.

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[codecov]

Codecov Report

Merging #55569 (c6447f8) into master (ffe3018) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head c6447f8 differs from pull request most recent head 85e785e. Consider uploading reports for the commit 85e785e to get more accurate results

@@           Coverage Diff           @@
##           master   #55569   +/-   ##
=======================================
  Coverage   77.42%   77.42%           
=======================================
  Files        1891     1895    +4     
  Lines      187544   187529   -15     
=======================================
+ Hits       145199   145201    +2     
+ Misses      42345    42328   -17     

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@samestep has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@samestep has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@samestep has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@samestep has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@samestep merged this pull request in f3367f9.