[chore] Add release:risky-change on PRs touching certain files

[jade-guiton-dd]

Description

This modifies the "Add code owners to a PR" CI workflow, which automatically adds component-related labels to PRs, to also add the "release:risky-change" label if the PR touches a hard-coded list of files. Currently, this list is:

Makefile
Makefile.Common
.github/workflows/prepare-release.yml
.github/workflows/scripts/release-prepare-release.sh

I also specified the C locale in the tr command which gets the PR data. It probably won't matter in the Ubuntu-based CI, but I had issues with the Homebrew core-utils version of tr when testing locally. I can remove this change if you think it's unnecessary.

Link to tracking issue

Fixes #11857

Testing

I did some dry runs locally with a few PRs that did or did not touch the relevant files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.18%. Comparing base (a8b2be1) to head (b1b3e60).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12552      +/-   ##
==========================================
- Coverage   92.22%   92.18%   -0.04%     
==========================================
  Files         469      469              
  Lines       25323    25395      +72     
==========================================
+ Hits        23353    23410      +57     
- Misses       1563     1574      +11     
- Partials      407      411       +4     

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[mx-psi]

Should we change the title of the CI job and the script to reflect the expanded scope?

[jade-guiton-dd]

Yeah that makes sense.

[jade-guiton-dd]

I also renamed the add-labels job to add-labels-command to differentiate the manual /label job from the automatic label addition