AAP-54064 clear RBAC data in migration step

[AlanCoding]

This is split from #1770 to be the minimum changes to facilitate the fix.

Jira Issue: https://issues.redhat.com/browse/AAP-54064

Assisted-by: Claude (kind of, it wasn't that much help for this)

Description

Without this, we can hit an upgrade error for the 2.5->2.6 line. This is because of the DAB 2.5 behavior of auto-registering the Team model. No models are intended to be registered, and you can see this in the setting in the base.py settings module. So there is no hazard in delete all rows in RBAC, as this does. RBAC is intended to be enabled and also unused and we will continue with that expectation.

Testing

TBD - do upgrade testing

Steps to test

Do full deployments in OCP, I don't have a local or minimal version of the fix. Although it would be possible.

Scenarios tested

TBD

Production deployment

• This code change is ready for production on its own
• This code change requires the following considerations before going to production:

Needs testing in production.

[AlanCoding]

Turned out this can't work.