[Test] Fix broken test_base_trainer (#27855)
[Test] Fix broken test_base_trainer (#27855)

The test was written incorrectly. This root cause was that the trainer & worker both requires 1 CPU, meaning pg requires {CPU: 1} * 2 resources.

And when the max fraction is 0.001, we only allow up to 1 CPU for pg, so we cannot schedule the requested pgs in any case.
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray