Fix FileOperationService starts foreground service failed.

Service#startForeground cannot use zero notification id.
Changing NOTIFICATION_ID_PROGRESS to 1. And use null tag
for foreground job notification.

Change-Id: I74f7e6e30a49766b31e88e2f9253654e3a1d0336
Fixes: 68392600
Fixes: 79779288
Test: Manually check if service destroy while copying job
Test: atest DocumentsUITests:FileOperationServiceTest