Add test config to libtextclassifier_tests

Details about test configs changes are tracked in doc
https://docs.google.com/document/d/1EWUjJ7fjy8ge_Nk0YQbFdRp8DSHo3z6GU0R8jLgrAcw/edit#

Bug: 35882476
Test: local test
Change-Id: I905ef9d123cd9684d6a858886e4912517a95562e
2 files changed