Make TensorFlow depend on RE2 avec Abseil. Since re2::StringPiece no longer exists in that world, tidy up and simplify accordingly.
Make TensorFlow depend on RE2 avec Abseil. Since re2::StringPiece
no longer exists in that world, tidy up and simplify accordingly.

PiperOrigin-RevId: 252580949

tensorflow/data-validation,tensorflow/data-validation,tensorflow/data-validation