Make a window translucent when a cursor is on another display

This is a similar CL to ag/33141167, but for the window surface.

Bug: 383240504
Test: WMShellUnitTests
Test: go/cd-smoke
Flag: com.android.window.flags.enable_connected_displays_window_drag
Change-Id: I2d7d089ba8cb2d9aa86ab27862778db45ec8aae5