OCM-3828: HTPasswd IDP unique username validation

[sagidayan]

No description provided.

[openshift-ci-robot]

@sagidayan: This pull request references OCM-3828 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.15.0" version, but no target version was set.

In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[nirarg]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nirarg, osherdp

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [nirarg,osherdp]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sagidayan]

/test unmanaged-oidc-config-e2e-presubmit

[nirarg]

/retest