[3/n] Create the new window for the torn tab from top-center at drop point

Based on the UX team meeting, it's decided that we're going to use
top-center for new windows' creation in tab tearing.

Flag: com.android.window.flags.enable_interaction_dependent_tab_tearing_bounds
Bug: 436504714
Test: atest WMShellUnitTests:DesktopTasksControllerTest
Change-Id: I440b093621d06ab5b348b763b1f047248e4c0622