webhook/testing: replace deprecated autoscaling/v2beta1 with autoscaling/v2

[anithapriyanatarajan]

Changes

🗑️ Replace deprecated autoscaling/v2beta1 imports with stable autoscaling/v2 in webhook/testing/listers.go

k8s.io/api v0.36.0 (Kubernetes 1.36) deleted k8s.io/api/autoscaling/v2beta1 and k8s.io/client-go/listers/autoscaling/v2beta1, which were deprecated since Kubernetes 1.12 and server-removed in Kubernetes 1.26.

The trigger for this PR is because Go resolves a single version of k8s.io/api across the entire module graph, any project that depends on both knative/pkg and k8s.io/api >= v0.36.0 hits a hard build failure:
k8s.io/api/autoscaling/v2beta1: module k8s.io/api@v0.36.0 found, but does not contain package k8s.io/api/autoscaling/v2beta1

Example case : Experienced this issue while upgrading k8s.io/client-go to 0.36.0(https://github.com/tektoncd/operator/blob/main/go.mod#L45) to address kubernetes/client-go@ea7a7e7 . We are blocked because of this.

/kind removal

Release Note

webhook/testing: replaced deprecated autoscaling/v2beta1 with stable autoscaling/v2. Projects depending on knative/pkg alongside k8s.io/api >= v0.36.0 will no longer hit a hard build failure due to the removed v2beta1 package.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: anithapriyanatarajan / name: Anitha Natarajan (3d2dad6)

[knative-prow]

Welcome @anithapriyanatarajan! It looks like this is your first PR to knative/pkg 🎉

[knative-prow]

Hi @anithapriyanatarajan. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[dprotaso]

/ok-to-test

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.87%. Comparing base (021ad70) to head (3d2dad6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
webhook/testing/listers.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3353   +/-   ##
=======================================
  Coverage   74.87%   74.87%           
=======================================
  Files         189      189           
  Lines        8347     8347           
=======================================
  Hits         6250     6250           
  Misses       1853     1853           
  Partials      244      244           

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anithapriyanatarajan, dprotaso

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Needs approval from an approver in each of these files:

• webhook/OWNERS [dprotaso]

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