Revert^2 Fix testRegisterComponentCallbacksOnWindowContext flaky

This flakiness is due to race of config updates when WindowContext attaches to
DisplyArea.
This CL fixed it by:
1. Don't dispatch config updates to the client side when registering to
   DA. We have reported the value by the return value of
   #attachWindowContextToDisplayArea.
2. Add lock in WindowTokenClient#onConfigurationChanged to avoid race.
   During applying DA's config to WindowContext, WindowContext may get another
   callback from the server side and dispatch to ComponentCallbacks
   unexpectedly.

Bug: 190019118
fixes: 228911504
Bug: 230022846
Test: atest RegisterComponentCallbacksTest --iterations
Test: atest WindowContextTest WindowContextTests
Test: atest WindowMetricsWindowContextTests
Change-Id: I2d749a058c7a3828c8c8288040236f005aa00ab6