Add branch-55 protection

[timsaucer]

To prepare for the 55 release, add protection to the branch-55 branch.

[alamb]

Thank you @timsaucer

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.29%. Comparing base (9b3b518) to head (b83349b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24293      +/-   ##
==========================================
- Coverage   81.29%   81.29%   -0.01%     
==========================================
  Files        1110     1110              
  Lines      385336   385311      -25     
  Branches   385336   385311      -25     
==========================================
- Hits       313261   313240      -21     
+ Misses      53594    53584      -10     
- Partials    18481    18487       +6     

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