Move EditMode to the STL in QSFragmentCompose

This gets rid of the AnimatedContent so now we have a single source of
transitions. This should help with initial compositions.

Test: manual, open and close edit mode.
Bug: 389985793
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Change-Id: I97e09936349fe426c97b30894beeadefcea5e747