Plan/Document migration from existing GitTracks to ClusterGitTracks + GitTracks

[JoelSpeed]

We will need to ensure that when migrating, resources are not deleted and users can safely re-adopt resources.

For this, we will likely need to create a script that users can run to remove all Owner References in Faros, which, when running, Faros will then correctly replace with the new and correct Owner References. This script and migration process will need documenting in the ReadMe so that users can easily migrate.