[release-v1.18] SO main move on-cluster builds namespace

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1592

/assign maschmid

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: openshift-cherrypick-robot
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[openshift-ci]

@openshift-cherrypick-robot: 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
ci/prow/419-images	07af02f	link	true	/test 419-images
ci/prow/419-test-e2e	07af02f	link	true	/test 419-test-e2e

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