fix(stage): wait for running verification to finish before next Promotion

[hiddeco]

Fixes: #2152
Fixes: #2128
Fixes: #2693

💡With the Stage mechanism determining what Promotion should be allowed to be processed next, we can get rid of the prioritized queue sometime in the future.

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[codecov]

Codecov Report

Attention: Patch coverage is 37.37374% with 62 lines in your changes missing coverage. Please review.

Project coverage is 49.05%. Comparing base (43031a5) to head (0574419).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/controller/promotions/watches.go	0.00%	36 Missing ⚠️
internal/controller/promotions/promotions.go	48.48%	15 Missing and 2 partials ⚠️
internal/controller/stages/stages.go	70.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2762      +/-   ##
==========================================
- Coverage   49.54%   49.05%   -0.49%     
==========================================
  Files         271      272       +1     
  Lines       19685    24196    +4511     
==========================================
+ Hits         9753    11870    +2117     
- Misses       9301    11690    +2389     
- Partials      631      636       +5     

☔ View full report in Codecov by Sentry.
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[krancour]

Test drove and this works quite well, except for one thing, which is that I find after a promo fails, I need to refresh the Stage to queue it for reconciliation and make it acknowledge the new highest priority promo as the current promo.

Something up with the stage reconciler's watch on promo status changes maybe?? A guess.

[hiddeco]

I have been unable to reproduce what you describe, but did find a UI bug which I took note of in #2773.