Moving the size override after other compat overrides to make sure the
letterbox overrides can be applied correctly. The fields overridden by
letterbox doesn't need extra override regarding the stable configuration
as all insets are already in consideration.

Besides, check shouldCreateCompatDisplayInsets() before applying the
override to avoid inconsistency when the compat display insets is not
yet created.

This is a partial cherry-pick contains the critical part of the change.

Bug: 332468995
Bug: 340970172
Bug: 336687188
Test: See reproduce steps in b/332468995
Test: CtsWindowManagerDeviceWindow:WindowMetricsActivityTests
Test: CtsWindowManagerSdk25TestCases:AspectRatioSdk25Tests
Test: v2/android-crystalball-eng/health/microbench/startup/hscapps/compile-speed-profile/open-maps
Merged-In: Iee7ae3ea7e483e6f80fa6ef4659627d620653081
Change-Id: If2e2e7f0eb504f2468f262b195f3a1cd28820423