OCPBUGS-49737: GCP: Update worker pointer Ignition when DNSType is ClusterHosted

[sadasu]

When UserProvisionedDNS is enabled, update worker pointer ignition to point to the API-Int LB IP.
Also, add unit test code to test this functionality.

- What I did

- How to verify it

- Description for the changelog

[openshift-ci-robot]

@sadasu: This pull request references Jira Issue OCPBUGS-49737, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.19.0) matches configured target version for branch (4.19.0)
• bug is in the state ASSIGNED, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @jianli-wei

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

In response to this:

When UserProvisionedDNS is enabled, update worker pointer ignition to point to the API-Int LB IP.
Also, add unit test code to test this functionality.

- What I did

- How to verify it

- Description for the changelog

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

@sadasu: 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/okd-scos-e2e-aws-ovn	5f9c5aa	link	false	/test okd-scos-e2e-aws-ovn
ci/prow/e2e-azure-ovn-upgrade-out-of-change	5f9c5aa	link	false	/test e2e-azure-ovn-upgrade-out-of-change
ci/prow/e2e-gcp-op-single-node	5f9c5aa	link	true	/test e2e-gcp-op-single-node

Full PR test history. Your PR dashboard.

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