Merge "Add manifest file for only DocumentsUI res for tests" into rvc-dev am: ed218c11 am: ac261b84 am: b675e920

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/11417362

Change-Id: I33dccf7de98f6839300dd8779a622df34a5253f9