Reduce continuations for bottom area

Quiet down some collects with distinctUntilChanged and
stateIn to cache frequent values. Also, use CREATED
instead of STARTED for lifecycle, so expanding the shade
while unlocked will cause the coroutines to collect again
since the shade window is visible.

Test: manual - use perfetto and analyze keyguard
Bug: 328319482
Flag: com.android.systemui.keyguard_bottom_area_refactor

Change-Id: I378ec3747fbb66d9ccd4c6615aa7f33ea39b0866