Merge "Add unit tests for tools/compare_cts_reports." into main am: 2b53c7eb2e

Original change: https://android-review.googlesource.com/c/platform/development/+/2749842

Change-Id: Iec372a821b9f849120d912d409a7e594f64b1c6b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>