Move trigger for dialog to change controls settings

Refactor the dialogs that were in ControlsActionCoordinatorImpl so they
can be called from multiple places. Preserve the behavior if
`FLAGS_USE_APP_PANELS` is false.

If the flag is true, they are called when `ControlsActivity` is
started on a locked device, requiring unlock
to actually change the settings. Regardless of the response, the
controls space is shown (it will only be triggered to change the
ALLOW_TRIVIAL_CONTROLS setting).

Test: atest com.android.systemui.controls
Fixes: 260731518
Change-Id: I1fd972d64a6f90179d4a9b282bb8fe4ac38048e6