docs: Document promotion pod decorators feature

[hairyhum]

No description provided.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.56%. Comparing base (e5f5a4c) to head (c0ab499).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6115      +/-   ##
==========================================
+ Coverage   57.44%   57.56%   +0.12%     
==========================================
  Files         474      474              
  Lines       40230    40469     +239     
==========================================
+ Hits        23110    23296     +186     
- Misses      15745    15789      +44     
- Partials     1375     1384       +9     

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[eddiewebb]

Should the new stage labels be added to https://deploy-preview-6115.docs.kargo.io/user-guide/reference-docs/annotations as well? (or where to EE only labels live?)

[hairyhum]

Should the new stage labels be added to https://deploy-preview-6115.docs.kargo.io/user-guide/reference-docs/annotations as well? (or where to EE only labels live?)

I don't think we have separate place. Updated annotations page.