Revert "Revert "Don't allow Desktop tasks to go outside Overview..."

Reland submission "Don't allow Desktop tasks to go outside Overview task bounds"

Reverted changes: /q/submissionid:30210454-revert-30114356-desktop-task-view-corner-clipping-KXYKHZHSWL

Change-Id: Ia263edcc876f9f72ca7f70733e96b0823dbd750e
Fix: 376206104
Flag: com.android.window.flags.enable_desktop_windowing_mode
Test: OverviewDesktopTaskImageTest, TaplTestsOverviewDesktop