Support to cleanup all existing edit monitor instances

Add a cleanup method in daemon manager to stop all the existing edit
monitor instances and place a block sign to provent any edit monitor to
start. This method is only used in emergency case when something goes
wrong with edit monitor and need immediate cleanup to prevent damage to
the system.

Test: atest daemon_manager_test
bug: 365617369
Change-Id: I8bff4f82a8ce272ccafb4ff8b076f05f56609426