Fennec 107.1.0

This includes a partial revert of https://github.com/mozilla-mobile/fenix/commit/18284a57132ad67a8379b1cb28fbfd1621359e3b

MozAC moved into a new project: https://github.com/mozilla-mobile/firefox-android

Also added a workaround for Glean compile due to gradle plugin conflict.

The option for a custom addon collection was put behind a flag, second commit enables it.