Merge "Freeze task list if requested when launching split tasks" into sc-v2-dev am: ea77e49524 am: 27682fe8b4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16245857

Change-Id: Ia941a13ace453dbfaaff29333c73f9d02857e989