[wip] Allow manual scaling of the Pod Autoscaler

[dprotaso]

• Exclude autoscaling annotations from everything but the KPA
• propagate annotation updates to the Pod Autoscaler

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

❌ Patch coverage is 76.31579% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.05%. Comparing base (54868c2) to head (6c3267f).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/testing/functional.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16186      +/-   ##
==========================================
- Coverage   80.08%   80.05%   -0.03%     
==========================================
  Files         214      214              
  Lines       16940    16949       +9     
==========================================
+ Hits        13566    13569       +3     
- Misses       3015     3018       +3     
- Partials      359      362       +3     

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[knative-prow]

@dprotaso: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
istio-latest-no-mesh_serving_main	6c3267f	link	true	/test istio-latest-no-mesh

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