fix: Kustomize skip commit if nothing changed

[Fs02]

Related: #371

• If a change to manifest is not synced, image updater will keep trying to update the image and try to produce a commit without any changes, this is resulting in error log and metrics which is noisy
• This PR will skip commit for kustomization file when nothing is changed. this case can happen when the manifest in git is not synced

[lukaszsurfer]

👋 It looks like a year has passed and the problem is still active, the merge is welcome 😄

[chengfang]

@lukaszsurfer thanks for bringing that up. Will take a look.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.

Project coverage is 75.53%. Comparing base (13f01ec) to head (49c6542).

Files with missing lines	Patch %	Lines
pkg/argocd/git.go	52.94%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
+ Coverage   75.47%   75.53%   +0.05%     
==========================================
  Files          31       31              
  Lines        3144     3151       +7     
==========================================
+ Hits         2373     2380       +7     
  Misses        636      636              
  Partials      135      135              

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[chengfang]

I resolved the conflict and moved some code, and can you all please take another look?