Migrate gateway-api jobs to eks-prow-build-cluster

[rjsadow]

This PR transitions the gateway-api jobs from the default cluster to eks-prow-build-cluster

ref: #29722

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rjsadow
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[k8s-ci-robot]

@rjsadow: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-test-infra-prow-checkconfig	08c1490	link	true	/test pull-test-infra-prow-checkconfig
pull-test-infra-unit-test	08c1490	link	true	/test pull-test-infra-unit-test
pull-test-infra-verify-lint	08c1490	link	true	/test pull-test-infra-verify-lint

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[rjsadow]

Closing for #29747