Add a timeout for CancellationSignal issued to AppFunctionService before which it is unbound.

Change-Id: If9c66bf7951b72e66d7780a58595b58c4f495f3d
Flag: android.app.appfunctions.flags.enable_app_function_manager
Test: atest CtsAppFunctionTestCases -c
Bug: 360864791
8 files changed