fix(promo): honor Argo CD sync windows

[rbreeze]

Fixes #2078

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[krancour]

I had been contemplating Kargo having its own windows for things like freight discovery/production, promotions, etc. so things work uniformly for all gitops agents -- this is supposing we support others in the future. But this might be a good interim solution, so let's still consider it. 👀 tomorrow.

[codecov]

Codecov Report

Attention: Patch coverage is 0.67114% with 148 lines in your changes missing coverage. Please review.

Project coverage is 47.24%. Comparing base (6dc367b) to head (eb20c33).
Report is 207 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontroller/argocd/api/v1alpha1/application_types.go	0.00%	124 Missing ⚠️
...troller/argocd/api/v1alpha1/application_helpers.go	0.00%	17 Missing ⚠️
internal/controller/promotion/argocd.go	0.00%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2346      +/-   ##
==========================================
- Coverage   47.64%   47.24%   -0.41%     
==========================================
  Files         244      244              
  Lines       17392    17540     +148     
==========================================
  Hits         8287     8287              
- Misses       8694     8841     +147     
- Partials      411      412       +1     

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[krancour]

This is based on legacy promo mechs, which have been fully removed at this point.

This will have to be resolved differently.