Fix jank on shade expansion

When the shade is expanded, the window becomes visible
which activates a whole series of coroutines to become
active immediately and cause jank. Until scopes are
properly put in place, keep these active and avoid
jank

Bug: 358441729
Test: use perfetto to look for missed frames
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: Ia01ff0ace560e9f969eab033738eb0f4143987e6