[AIR] Run `test_tensorflow_predictors.py` and fix failing tests (#25208)
[AIR] Run `test_tensorflow_predictors.py` and fix failing tests (#25208)

`test_tensorflow_predictors` wasn't running in CI. This fixes that and also fixes broken tests.

Co-authored-by: Amog Kamsetty <bb6cdf742ece99f78d3d69aad127491bb98d7489@yahoo.com>
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray