Add a new CTS test for DCL read-only enforcement am: d3a8a9e960 am: d073a7265c am: aafc2cef15

Original change: https://android-review.googlesource.com/c/platform/art/+/2299577

Change-Id: Ib4f08ff2e5ee31ccc8065855e16618623c5e8c0e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>