chore(backport release-1.9): fix(controller): fix broken branch locks in git-push step

[akuitybot]

Automated backport to release-1.9, triggered by a label in #5888.

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[codecov]

Codecov Report

❌ Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.26%. Comparing base (0e07239) to head (9f60698).
⚠️ Report is 1 commits behind head on release-1.9.

Files with missing lines	Patch %	Lines
pkg/promotion/runner/builtin/git_pusher.go	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.9    #5890      +/-   ##
===============================================
- Coverage        56.27%   56.26%   -0.01%     
===============================================
  Files              451      451              
  Lines            37851    37855       +4     
===============================================
- Hits             21302    21301       -1     
- Misses           15288    15292       +4     
- Partials          1261     1262       +1     

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