Add CUJ Jank interactions for App Pair saving and launching

* Added finishCallback consumer to LauncherAccessibilityDelegate
to inform when adding an item to workspace was completed.
* The logic seemed to be dependent on the parameter
"focusForAccessibility", but all callers of that are currently
passing in true

Bug: 328646540
Test: https://paste.googleplex.com/6232597136408576
Newly added CUJs showing up when playing w/ device

Change-Id: I5dce4b7e83fb17cc3a70565bfd5ce100a4cf72bb