Disable dragging from fullscreen to split screen in connected display

This CL disables app handle dragging from fullscreen to split screen in CD behind
the non default split flag.

Test: manual
Bug: 444361656
Flag: com.android.window.flags.enable_non_default_display_split
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d7d80904bd11d489f5964c3e59d16caf41d0a7e7
Merged-In: Id0f2e90a718573015b30f7e5b858ce3aa2b4c4f4
Change-Id: Id0f2e90a718573015b30f7e5b858ce3aa2b4c4f4