[a11y] Add FLAG_NOT_PINNABLE and modify `supportAddToWorkSpace`.

// play uninstalled app
Bug: 286998395
Bug: 287156208
Bug: 287157282
// contact
Bug: 287362865
Bug: 287370843
Bug: 287372663
// clock
Bug: 287166186
Bug: 287166771
Bug: 287167527
Test: manual
Flag: N/A

Change-Id: I859deba6218e232a232f009793044ca4be2cab19