Migrate autoscaler stat forwarder to use EndpointSlices

[dprotaso]

Part of #7701

• switch autoscaler stat forwarder to use endpoint slices
• Cleanup older autoscaler endpoints

Autoscaler will now create EndpointSlices instead of Endpoints to perform lease based stat forwarding

[knative-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 75.67568% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.14%. Comparing base (56af9d4) to head (85133f4).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cleanup/cmd/cleanup/cleanup.go	0.00%	8 Missing ⚠️
pkg/autoscaler/statforwarder/leases.go	96.29%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16448      +/-   ##
==========================================
- Coverage   80.21%   80.14%   -0.07%     
==========================================
  Files         217      217              
  Lines       13520    13533      +13     
==========================================
+ Hits        10845    10846       +1     
- Misses       2307     2320      +13     
+ Partials      368      367       -1     

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[dprotaso]

/retest

[dprotaso]

/hold cancel
/assign @linkvt

[dprotaso]

There's an issue with a assertion

/hold

[dprotaso]

I'm pulling the test changes to a separate PR

/hold cancel

[linkvt]

Do we need to add an equivalent rule for endpointslices? I read that this is openshift specific but maybe nevertheless good to keep it consistent with the endpoints logic.

[dprotaso]

I don't know what the equivalent is for OpenShift - or if this is still a thing that OpenShift needs.

Can you confirm and make changes in a follow up PR.