RHACS: OpenShift OAuth Integration is deprecated

[sluetze]

The OpenShift auth identity provider, which served as an identity provider (IdP) for RHACS, is deprecated and is anticipated to be removed in a future release. You can authenticate users by using OpenID Connect (OIDC) IdP integrations instead.

We should move to a direct integration into Keycloak instead

[sluetze]

/assign

[rbo]

@sluetze we try to keep all issues in https://github.com/stormshift/support/issues - it's ok for you to transfer the issue?