Add a soong flag to use Compose in Launcher (1/3)

This will allow us to add/remove Compose dependencies from Launcher during the build. It prevents landing the dependencies without having any feature using it.

Ignore-AOSP-First: in topic with internal-first/internal-only projects

Bug: 346288480
Flag: EXEMPT We added a build flag. Soong flag: release_enable_compose_in_launcher. Gantry Build flag: RELEASE_ENABLE_COMPOSE_IN_LAUNCHER.
Test: Builds
Change-Id: Ie2dabc98977dfb267a9bc7934354a72052c6664d