[release-4.22][OCPBUGS-88312] cherry-pick use in-cluster service for oauth-server

[Tamas-Biro1]

What this PR does / why we need it:

When a user clicks “Display Token”, the oauth-openshift service attempts to call itself using the cluster’s API endpoint.
This self-call fails depending on whether the oauth-server is configured a public or private service URL as MasterURL.

In case of a public URL and control plane outbound connecitivty is restricted, the call fails.
In case a private URL, it can happen that the DNS is also a private one, and DNS resolution fails.

Which issue(s) this PR fixes:

Fixes OCPBUGS-88312

Special notes for your reviewer:

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-merge-bot]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Tamas-Biro1
Once this PR has been reviewed and has the lgtm label, please assign bryan-cox for approval. For more information see the Code Review Process.

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[openshift-ci]

Hi @Tamas-Biro1. Thanks for your PR.

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