Remove bazelbuild/rules_k8s config and Prow jobs from k8s Prow

[chizhg]

Fixes bazelbuild/rules_k8s#669 (comment)

[chizhg]

/hold
Do we still need the build cluster? It seems the traffic for this repo is very low.

[fejta]

Separate build clusters are as much about having separate security boundaries as anything involving resources.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chizhg, fejta

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[k8s-ci-robot]

@chizhg: PR needs rebase.

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[k8s-ci-robot]

@chizhg: The following test 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-image-build-test	57d778b	link	true	/test pull-test-infra-prow-image-build-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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