Migrate WindowContext#onConfigurationChanged to ClientTransaction (1/n)

This reverts commit cefd3f4d.

The test failure in b/291681939 is because the original change in
WindowContextControllerTest forgot to reset the
WindowTokenClientController after the test.

Bug: 290876897
Bug: 291681939
Test: atest FrameworksCoreTests:WindowContextControllerTest
Test: atest FrameworksCoreTests:WindowContextTest
Change-Id: I195da65ad5c7f2216c7ea14c5c0be78bfd284ff2