Add a config to disable registering Shell Transitions in dagger

This is needed for android-auto where shell is actually in launcher
vs systemui.

Also have TaskViewTransitions use this information instead of checking
the flag so that it doesn't do anything in the process where it isn't
registered.

Bug: 255631687
Test: everything still works as expected
Change-Id: I61ad21575850f15fd821cc5c8239bf7246549936