Consolidate Bubble WCT

1. Migrate WCT#setDisableLaunchAdjacent to Change since it is not a
   hierarchy operation.
2. Refactor Bubble WCT to use the same helper method.

Bug: 407669270
Test: atest WmTests:WindowContainerTransactionTests
Test: atest WMShellUnitTests:BubbleUtilsTest
Flag: EXEMPT refactor
Change-Id: Iddaf73e9fb40be26fc221f8a67a4c02db9c38cdb