Enable Gateway API for kind test

[nak3]

As far as testing, the KinD test pases - https://github.com/nak3/serving/actions/runs/4190405898 with the current version.

Related to knative-extensions/net-gateway-api#275

[knative-prow]

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[codecov]

Codecov Report

Base: 86.17% // Head: 86.21% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (75a3598) compared to base (08812b3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13710      +/-   ##
==========================================
+ Coverage   86.17%   86.21%   +0.04%     
==========================================
  Files         197      197              
  Lines       14774    14774              
==========================================
+ Hits        12731    12737       +6     
+ Misses       1738     1735       -3     
+ Partials      305      302       -3     

Impacted Files	Coverage Δ
pkg/activator/net/revision_backends.go	92.19% <0.00%> (-0.58%)	⬇️
pkg/reconciler/configuration/configuration.go	84.36% <0.00%> (+1.42%)	⬆️
pkg/autoscaler/statserver/server.go	77.37% <0.00%> (+3.64%)	⬆️

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[nak3]

Umm... still flake remains. Closing for now.