[automerger skipped] Add migration tests for IS_PRIVATE column. am: 591d5f13b9 -s ours

am skip reason: Change-Id Ib837c543fceb16335e932529c9e9625f01940dab with SHA-1 bee78ec87b is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/providers/MediaProvider/+/13287327

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I27538da61c0820afc3c6b45caacdb44d89d0de36