OCPBUGS-70835: tokenrequest: Use custom HostnameError formatting

[tchap]

This is to mitigate CVE-2025-61729

I will update oc once this is merged so that I can use the helper method defined here.

[openshift-ci-robot]

@tchap: This pull request references Jira Issue OCPBUGS-70835, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
• expected Jira Issue OCPBUGS-70835 to depend on a bug targeting a version in 4.20.0, 4.20.z and in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but no dependents were found

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

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

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In response to this:

This is to mitigate CVE-2025-61729

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

@tchap: all tests passed!

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