WIP: Azure: implement private KAS endpoint support using private link

[muraee]

What this PR does / why we need it:

This adds support to deploy azure clusters with private apiservers accessbile only from the private network. For this a new internal load balancer for the shared-ingress router and an associated private link service with enabled proxy protocol is created. Each azure private cluster will create a private endpoints and connect to the shared-ingress private link service. Connections going through the private link will have a linkID in the proxy header which is extracted by the shared-ingress router and used to decide which cluster's KAS the request will be routed to.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story: Fixes #

Checklist

• [ ] Subject and description added to both, commit and PR.
• [ ] Relevant issues have been referenced.
• [ ] This change includes docs.
• [ ] This change includes unit tests.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: muraee

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[openshift-ci[bot]]

@muraee: 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-ibmcloud-roks	3c4ad1287974c142350f1c17ccd9bd10c8c86cf1	link	false	/test e2e-ibmcloud-roks
ci/prow/e2e-ibmcloud-iks	3c4ad1287974c142350f1c17ccd9bd10c8c86cf1	link	false	/test e2e-ibmcloud-iks
ci/prow/e2e-azure	3c4ad1287974c142350f1c17ccd9bd10c8c86cf1	link	false	/test e2e-azure
ci/prow/e2e-aks	9e58be86f70f9ce1c83fc7befbac14155e9d604f	link	true	/test e2e-aks

Full PR test history. Your PR dashboard.

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