Merge "Revert "Use new onStartSplitLegacy when starting split from overview""...

Merge "Revert "Use new onStartSplitLegacy when starting split from overview"" into tm-dev am: 8340cb6d am: 78194ca6 am: 0536d163

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17918609



Change-Id: I13f49f46c24db03a4bc090ce5c5b95b0ade4abd3
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>