Use CheckEndpointState in v1beta1 domainmapping test

[nak3]

This patch replaces WaitForEndpointState with CheckSuccessfulResponse in v1beta1/domain_mapping_test.go.
Other code were changed by #11680.

The same test in v1alpha1/domain_mapping_test.go uses CheckSuccessfulResponse so it should not be a problem.

[codecov]

Codecov Report

Merging #12373 (a5618b5) into main (a6e26e5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #12373   +/-   ##
=======================================
  Coverage   87.37%   87.37%           
=======================================
  Files         195      195           
  Lines        9638     9638           
=======================================
  Hits         8421     8421           
  Misses        933      933           
  Partials      284      284           

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[nak3]

/cc @shinigambit @julz @markusthoemmes

[dprotaso]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, nak3

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[dprotaso]

/test pull-knative-serving-istio-latest-no-mesh
/test pull-knative-serving-istio-latest-no-mesh-tls