feat: make add-team-label use the reusable workflow

[itsyoboieltr]

Description

Instead of copy-pasting the implementation of add-team-label to other repositories, such as metamask-extension and metamask-mobile, it should be possible to call the workflow directly from the github-tools repository, if we make it a reusable workflow. This is great, because if we make a change to the workflow in the github-tools repository, the changes propagate to other repositories as well.

More information about reusable workflows: https://docs.github.com/en/actions/using-workflows/reusing-workflows

This kind of aligns with MetaMask/metamask-extension#25509, but not exactly. The shared library would still be needed nevertheless, as this is only sharing the workflow definition, but not the scripts that are run during the workflow. The scripts still need to exist in all the repositories (for now). Ideally, we would make the shared library an npm package that can be installed in the different repositories to allow for the sharing of scripts.

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/2760

Manual testing steps

1. Have the workflow run the same as before, without it being defined in the repository.

Screenshots/Recordings

Not applicable

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.63%. Comparing base (4b9f31c) to head (9c5120e).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10350      +/-   ##
==========================================
- Coverage   49.78%   49.63%   -0.15%     
==========================================
  Files        1437     1446       +9     
  Lines       34762    35022     +260     
  Branches     3921     3968      +47     
==========================================
+ Hits        17307    17384      +77     
- Misses      16354    16539     +185     
+ Partials     1101     1099       -2     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[NicolasMassart]

Looks good to me.
Thanks for the investigation on using the hash!