SF: Implement leader display promotion/demotion

Remove Scheduler::mRefreshRateSelector by using mLeaderDisplayId to look
up the leader's RefreshRateSelector. Replace setRefreshRateSelector with
setLeaderDisplay. Add logic to demote/promote the leader display (always
the primary display for now) when displays are added/changed/removed.

This fixes a regression where Scheduler::applyPolicy no longer respected
the active display after Ifa1bf23bc991fe60e67dba1cb31077e42fd5396e.

Bug: 255635821
Bug: 241286431
Test: Fold/unfold
Test: dumpsys SurfaceFlinger --scheduler
Change-Id: Ib1e8eacd2cdbf0d798ff7e8bb9c25607972104f5