[3/n] Set appBounds to exclude caption insets

If task is unresizeable:
1. Sends appBounds from shell in desktop mode which excludes caption
   insets
2. Disables force consumption of insets

Flag: com.android.window.flags.exclude_caption_from_app_bounds
Bug: 388014743
Test: atest DesktopTasksControllerTest
      atest WindowDecorationTests
      atest DesktopModeCompatPolicyTest
      atest DesktopModeWindowDecorationTests
Change-Id: Ic06d98c38595187d122eea7b3ee002fb67399d36