infra(ci): prepare CI for GitHub merge queues

[ST-DDT]

Updates the workflow files to contain triggers for merge queues.

(all files that have required checks, must be tagged with the merge_queue trigger)

• https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue#triggering-merge-group-checks-with-github-actions

This is my first attempt at this, so I'm not sure whether I configured this correctly.
Not sure how to test this, I cannot test this in my private fork of Faker (as merge queues seem to be an organization feature?).

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Technical explanation about merge queues:

GitHub's merge queues are ways to merge PRs in rapid succession without omitting CI tests.

• PRs that gets added to the queue are synced to the target branch,
• the CI is triggered
  • and if successful, the PR is merged
  • if not successful, the PR is removed from the merge queue
• The next PR from the merge queue is processed

Documentation

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At this point in time I'm not sure whether we should use merge queues, but I would like to enable them to gain some experience in their utility. If you have some insides into them, please let me know.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (df87d60) to head (327c639).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3245      +/-   ##
==========================================
- Coverage   99.97%   99.96%   -0.01%     
==========================================
  Files        2805     2805              
  Lines      217098   217098              
  Branches      973      966       -7     
==========================================
- Hits       217034   217018      -16     
- Misses         64       80      +16     

see 1 file with indirect coverage changes