Revert "Implement UMO transitions to & from the communal hub"

This reverts commit eb8bf79795c7ea46d19bd07fb880baf59497c92b.

Reason for revert: Probable culprit for b/327643568. Will be verifying through ABTD for confirmation and before submitting the revert.

Change-Id: I702c9347db7e76ad34d09a87dcd3cf97d9ce7dbd
10 files changed