[Unfold animation] Start Launcher animation preemptively to synchronize the first frame

Starts unfold animation in Launcher right after receiving
configuration change for the unfolded screen.
This makes sure that before we unblock the screen we
have the first frame of the unfold animation ready
in Launcher (transformations are applied).

Bug: 271099882
Test: atest com.android.systemui.unfold.util.PreemptiveUnfoldTransitionProgressProviderTest
Test: manual testing fold/unfold, checking perfetto traces
Test: test with flag enabled/disabled
Change-Id: Icb8f91f9264248600d4bed14811445f50aac99c7