Synchronize the setup process of edit monitor

This cl ensures only one edit monitor instance is in the setup proecess
by requesting exclusive file lock on a setup lock file. If there is
already an edit monitor in setup process, other instances trying to
setup will fail. This prevents race conditions when multiple edit
monitor instance are starting.

Test: atest daemon_manager_test
bug: 382135550
Change-Id: Ia8bd2f35318ae81fc002ccce62e2fde3b8cae26b