fix: honor repo depth setting in gitSourceHasChanges and fetch functions (cherry-pick #27838 for 3.3)

[alexandresavicki]

Cherry pick of #27838 to release-3.3.

The automatic cherry-pick failed due to a merge conflict in reposerver/repository/repository.go caused by structural differences between master and release-3.3 (the repoLock.Lock callback signature and checkoutRevision parameters differ between branches).

The conflict was resolved by adapting the fix to the release-3.3 code structure:

• checkoutRevision(gitClient, revision, false, 0) → checkoutRevision(gitClient, revision, false, repo.Depth)
• s.fetch(gitClient, []string{syncedRevision}) → s.fetch(gitClient, []string{syncedRevision}, repo.Depth)

[alexandresavicki]

Hey @blakepettersson, this is a manual cherry-pick of #27838 to release-3.3 (the automatic one failed due to merge conflicts). Could you review and merge when you get a chance? Thanks!

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.92%. Comparing base (6d68924) to head (77465f0).

Files with missing lines	Patch %	Lines
reposerver/repository/repository.go	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-3.3   #28065      +/-   ##
===============================================
+ Coverage        62.91%   62.92%   +0.01%     
===============================================
  Files              353      353              
  Lines            50327    50333       +6     
===============================================
+ Hits             31661    31673      +12     
+ Misses           15632    15621      -11     
- Partials          3034     3039       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[alexandresavicki]

Thanks for the merge @blakepettersson! Any chance a v3.3.12 patch release could be cut soon? We're waiting on this fix to properly use shallow clones in our setup. Happy to help if there's anything needed from my side.