chore(kuma-cp) migrate DiscoveryRequest/Response in KDS to V3 (backport #2541)

[mergify]

This is an automatic backport of pull request #2541 done by Mergify.
Cherry-pick of 5752bd6 has failed:

On branch mergify/bp/release-1.2/pr-2541
Your branch is up to date with 'origin/release-1.2'.

You are currently cherry-picking commit 5752bd67.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   api/mesh/v1alpha1/kds.pb.go
	modified:   api/mesh/v1alpha1/kds.proto
	modified:   api/mesh/v1alpha1/mux.pb.go
	modified:   api/mesh/v1alpha1/mux.proto
	modified:   pkg/kds/client/sink_test.go
	modified:   pkg/kds/client/stream.go
	modified:   pkg/kds/mux/client.go
	modified:   pkg/kds/mux/clientstream.go
	modified:   pkg/kds/mux/serverstream.go
	modified:   pkg/kds/mux/session.go
	modified:   pkg/kds/mux/session_test.go
	new file:   pkg/kds/mux/version.go
	modified:   pkg/kds/reconcile/interfaces.go
	modified:   pkg/kds/reconcile/reconciler.go
	modified:   pkg/kds/reconcile/snapshot_generator.go
	modified:   pkg/kds/server/components.go
	modified:   pkg/kds/server/kds.go
	modified:   pkg/kds/server/server_test.go
	modified:   pkg/kds/server/status_tracker.go
	modified:   pkg/kds/util/resource.go
	modified:   pkg/test/grpc/clientstream.go
	modified:   pkg/test/grpc/serverstream.go
	modified:   pkg/test/kds/verifier/context.go
	modified:   pkg/test/kds/verifier/executables.go
	modified:   test/e2e/compatibility/compatibility_suite_test.go
	new file:   test/e2e/compatibility/cp_compatibility_kubernetes_multizone.go
	new file:   test/e2e/compatibility/cp_compatibility_kubernetes_multizone_test.go
	modified:   test/framework/setup.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/kds/cache/snapshot.go
	both modified:   pkg/kds/server/type_adjust_callbacks.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-1.2@82dd4ec). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 5752bd6 differs from pull request most recent head 6d46374. Consider uploading reports for the commit 6d46374 to get more accurate results

@@              Coverage Diff               @@
##             release-1.2    #2551   +/-   ##
==============================================
  Coverage               ?   52.36%           
==============================================
  Files                  ?      871           
  Lines                  ?    48437           
  Branches               ?        0           
==============================================
  Hits                   ?    25366           
  Misses                 ?    21020           
  Partials               ?     2051           

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[jakubdyszkiewicz]

@Mergifyio refresh

[mergify]

Command refresh: success

Pull request refreshed