Stop some dbus proxies when they are unneeded
This automatically stops the dbus proxies for Tor Browser and Onion Circuits. Doing the same for TCA and Unsafe Browser takes a bit more effort so it will be done separately.
Refs: Only run dbus-proxy services when they are needed (#19390)
This is based on !1018 (merged), please review and merge after that!
Edited by segfault