Reducing number of configuration changes during PiP transition.

- Fixes issue with the incorrect calculation of configuration smallest
  width for floating and always-fullscreen stacks.  Fullscreen stacks
  now have the smallest width matching the display, and floating stacks
  are set to the smallest size of their bounds.
- This CL also ensures that we test the combined global/override configs
  for changes in case changes when moving between stacks results in a
  shift in the configuration between the parent to the override of the
  child (ie. when going from fullscreen -> pinned)
- Also ensure that we are animating to the right fullscreen bounds for
  the PiP transition, accounting for the insets when calculating the config
  change the same way we would do for fullscreen tasks.

Bug: 33779483
Test: android.server.cts.ActivityManagerConfigChangeTests passes
Test: android.server.cts.ActivityManagerPinnedStackTests
Test: #testSingleConfigurationChangeDuringTransition
Change-Id: I2c2b695572cd17087d522cf6c8ebd105e57e08b8