[release-1.18] Fix: PodAutoscaler not reconciled due to missing class annotation

[knative-prow-robot]

This is an automated cherry-pick of #16141

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.86%. Comparing base (9abfc28) to head (706ba71).
⚠️ Report is 1 commits behind head on release-1.18.

Files with missing lines	Patch %	Lines
pkg/reconciler/revision/cruds.go	72.72%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.18   #16190      +/-   ##
================================================
- Coverage         80.87%   80.86%   -0.01%     
================================================
  Files               210      210              
  Lines             16760    16771      +11     
================================================
+ Hits              13554    13562       +8     
- Misses             2857     2859       +2     
- Partials            349      350       +1     

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[dprotaso]

/retest

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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