Better errors from copyResource

Copy resource would fail without a good error code when the file
couldn't be found during copy.

Also destroy the target container ID during move operations since it
might exist. If the copy failed due to it existing, it would get
destroyed anyway. This way the user has a chance to have a good outcome
the first time.

Bug: 3375299
Bug: 5113898
Change-Id: I00559833f0801bc50e7cc031b462495e37a6b4ab