[wm]: Prevent app relayout or relaunch by inset in freeform mode

When freefrom window region is located over navigation bar this may cause configuration change by inset
leading to relayout or relaunch of activity. So disregard inset while in freeform

Test: manual - Observe freeform layout change or blink when freeform is moved over to navigation bar or away from navigation bar
      atest WmTests:TaskRecordTests#testInsetDisregardedWhenFreeformOverlapsNavBar

Bug: 144058516
Change-Id: I2f3f2813c3c426aa6222885692217c5b6808e9ba
(cherry-picked from 09e19649a4c9ef5d3d7cabb1ead333e522255ff0)