Merge "Move MtsEthernetTetheringTest back into TetheringTest" into main am: 574bcb7f06

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3118546

Change-Id: I54b99de93d3542f621702570b55790f9af0f360d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>