Merge "Set up libtextclassifier_tests into MTS" into rvc-dev am: 0bce29a225 am: 0cc49dfcad

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libtextclassifier/+/11685296

Change-Id: I93e5272cf32d9f3de172c0e4feb8715b63352468