Switch to use fluid indicator surface

This commit switches to use fluid indicator surfaces instead of the
veiled ones for window drag across displays. We are using
SurfaceControl.mirrorSurface() to create the fluid surfaces.

demo: https://drive.google.com/file/d/1e0H8fgaxhYV2vQpEhgkCWIUN2TqPn1Jm/view

Bug: 395554573
Test: manual; atest
Flag: com.android.window.flags.enable_connected_displays_window_drag
Change-Id: I36c3bf22239e521f80fe4f11419cf10fadc25fef