Use legacy insets for compatibility behaviour

Use legacy nonDecorInsets and configInsets if app is targeting SDK 34 or
lower when resolving all activity-level configuration.

Flag: com.android.window.flags.insets_decoupled_configuration
Fix: 330888878
Fix: 333790938
Test: atest SizeCompatTests
      atest TaskTests
      atest AspectRatioSdk25Tests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:609ebc0f368672984d50820e2e5c1745c0d839e4)
Merged-In: I57287d906f650c2f3cefa83ed0acbabec4838c05
Change-Id: I57287d906f650c2f3cefa83ed0acbabec4838c05