update to discovery.k8s.io/v1

[kishorj]

Issue

Fixes: #3071

Description

This is the cherry pick of the fix to v2.4 branch.

Controller uses discovery.k8s.io/v1beta1, which is not supported starting k8s v1.25 release. This PR updates the controller to use discovery.k8s.io/v1. As a result, the controller will no longer support k8s 1.20 or earlier release if EndpointSlices feature is enabled via the controller flag.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[M00nF1sh]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj, M00nF1sh

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• OWNERS [M00nF1sh,kishorj]

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[codecov-commenter]

Codecov Report

Base: 54.07% // Head: 54.07% // No change to project coverage 👍

Coverage data is based on head (7cc13ca) compared to base (a92e689).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-2.4    #3073   +/-   ##
============================================
  Coverage        54.07%   54.07%           
============================================
  Files              144      144           
  Lines             8301     8301           
============================================
  Hits              4489     4489           
  Misses            3484     3484           
  Partials           328      328           

Impacted Files	Coverage Δ
pkg/backend/endpoint_resolver.go	86.41% <ø> (ø)
pkg/backend/endpoint_types.go	100.00% <ø> (ø)

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[M00nF1sh]

/lgtm