LPS-49567 add method to check if folder in trash
LPS-49567 take into account trash status when deleting a folder
LPS-49567 add tests to check new behaviour
LPS-49567 fix test

Test was using DLFolder API, which ignores trash entries. Use DLApp
service instead.
LPS-49567 SF - rename method
LPS-49567 SF
LPS-49567 SF