Install Gateway API CRDs for multicluster tests

[kahirokunn]

What

• Install Gateway API v1.4.1 experimental CRDs on the spoke kind cluster during multicluster e2e setup.
• Wait for the GatewayClass, Gateway, HTTPRoute, and ReferenceGrant CRDs to become Established before wiring the ClusterProfile.

Why

The multicluster Serving test enables net-gateway-api on the spoke cluster, but the spoke cluster did not install Gateway API CRDs first. With the 1.22 net-gateway-api controller manifest, the controller exposes readiness/liveness probes and stays unavailable when the required Gateway API resources are missing.

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.84%. Comparing base (641e806) to head (f90afb4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2288   +/-   ##
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  Coverage   63.84%   63.84%           
=======================================
  Files          55       55           
  Lines        2478     2478           
=======================================
  Hits         1582     1582           
  Misses        777      777           
  Partials      119      119           

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[houshengbo]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo, kahirokunn

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[kahirokunn]

Thank you 🙏