Merge "add congestion control test to CTS" into udc-dev am: 190965164f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23117205

Change-Id: I7cf0d91f260a1ec26f34ca37ec42db013ef8199f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>