[SB] Update StatusBarWindowStateRepository to be for any display.

StatusBarWindowStateRepository is no longer a singleton that injects the
display ID. Instead, it was renamed to
StatusBarWindowStatePerDisplayRepository and must be instantiated with a
specific display ID. StatusBarWindowStateRepositoryStore *is* a
singleton that lets other classes fetch a per-display repo instance for
either the default display or any display.

Bug: 364360986
Flag: EXEMPT code is unused for now
Test: atest StatusBarWindowStatePerDisplayRepositoryTest
StatusBarWindowStateRepositoryStoreTest

Change-Id: I0490cc7e005a8c7eca32fdecfe3ea579af188488