Merge "Move the Thread proguard flags to ConnectivityService's proguard.flags" into main am: 96361bc4cd am: 916300144f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2926180

Change-Id: I5745c1fce2630dba45af69f2a698265c8253afbd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>