chore(tests): switch to EndpointSlices for webhook tests #3998
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What this PR does / why we need it:
This PR fixes integration tests flakiness introduced by PR #3980.
Sometimes integration test
TestHTTPRouteValidationWebhook
This change should make this test passes constantly.
Which issue this PR fixes:
Furthermore it's part of the issue #3916 - getting rid of
CoreV1 Endpoints
Special notes for your reviewer:
It fixes the problem because now tests rely on DiscoveryV1 EndpointSlices instead of old CoreV1 Endpoints. It used to work sometimes because the cluster's control plane mirrors most Endpoints resources to corresponding EndpointSlices as described in docs. When the test failed it means that race condition occurred - the test expected to have EndpointSlices available before they had been created. It explains that only sometimes the test fails.
PR Readiness Checklist:
Complete these before marking the PR as
ready to review
:CHANGELOG.md
release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR