OCPBUGS-46422: Add test that the ServiceCIDR API is blocked [4.20]

[danwinship]

backport of #30234
This won't pass until openshift/cluster-network-operator#2827 merges, but it can still be reviewed before then

[openshift-ci-robot]

@danwinship: This pull request references Jira Issue OCPBUGS-46422, which is valid.

7 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.20.z) matches configured target version for branch (4.20.z)
• bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)
• release note type set to "Release Note Not Required"
• dependent bug Jira Issue OCPBUGS-61196 is in the state Verified, which is one of the valid states (VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA))
• dependent Jira Issue OCPBUGS-61196 targets the "4.21.0" version, which is one of the valid target versions: 4.21.0
• bug has dependents

Requesting review from QA contact:
/cc @anuragthehatter

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

backport of #30234
This won't pass until openshift/cluster-network-operator#2827 merges, but it can still be reviewed before then

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

@danwinship: 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/e2e-gcp-ovn	88f25ed	link	true	/test e2e-gcp-ovn
ci/prow/e2e-metal-ipi-ovn-ipv6	88f25ed	link	true	/test e2e-metal-ipi-ovn-ipv6
ci/prow/e2e-vsphere-ovn-upi	88f25ed	link	true	/test e2e-vsphere-ovn-upi
ci/prow/e2e-vsphere-ovn	88f25ed	link	true	/test e2e-vsphere-ovn
ci/prow/okd-scos-e2e-aws-ovn	88f25ed	link	false	/test okd-scos-e2e-aws-ovn
ci/prow/e2e-aws-ovn-fips	88f25ed	link	true	/test e2e-aws-ovn-fips

Full PR test history. Your PR dashboard.

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