Merge "Add hidden API getDataSaverViaCmFlag() for CTS" into main am: eb33cf470d am: 312f86816d am: 8260641651

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2822810

Change-Id: I130b8e4528c95b10b195b4af64108f111d194bd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>