[SB][Screen Chips] Hook up new chip flow to CollapsedStatusBarFragment.

Bug: 332662551
Test: Enable flag, then start screen recording -> verify chip shows up
in left-hand side of the status bar. Stop screen recording -> verify
chip disappears
Test: Disable flag, then start ongoing call -> verify old ongoing call
chip shows up
Test: atest CollapsedStatusBarFragmentTest
Flag: com.android.systemui.status_bar_screen_sharing_chips

Change-Id: I5f4b9817c1a3e07d2fda5a36bdd1c84d7cad21c0