Merge changes I76349d86,I003eaedd,I89961f96,If96a18f5,I32ab6e9f, ... into main

* changes:
  Clean-up QS footer actions initialization
  Delete DensityAwareComposeView
  Delete the COMPOSE_QS_FOOTER_ACTIONS flag
  Delete the old implementation of the QS footer actions
  Delete the COMPOSE_PEOPLE_SPACE flag
  Delete the old implementation of PeopleSpaceActivity