chore(backport release-0.8): fix(controller): improve logic to determine when syncing an argo cd app is required

[akuitybot]

Automated backport to release-0.8, triggered by a label in #2433.

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[codecov]

Codecov Report

Attention: Patch coverage is 68.25397% with 40 lines in your changes missing coverage. Please review.

Project coverage is 46.76%. Comparing base (1e0919b) to head (d7520e5).
Report is 1 commits behind head on release-0.8.

Files	Patch %	Lines
internal/controller/promotion/pullrequest.go	0.00%	17 Missing ⚠️
internal/controller/promotions/promotions.go	0.00%	12 Missing ⚠️
internal/controller/promotion/composite.go	84.84%	3 Missing and 2 partials ⚠️
internal/controller/promotion/git.go	79.16%	5 Missing ⚠️
internal/controller/promotion/argocd.go	97.50%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.8    #2442      +/-   ##
===============================================
+ Coverage        46.65%   46.76%   +0.10%     
===============================================
  Files              246      246              
  Lines            17703    17699       -4     
===============================================
+ Hits              8260     8277      +17     
+ Misses            9017     8994      -23     
- Partials           426      428       +2     

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