[Test][Autoscaler][2/n] Add Ray Autoscaler e2e tests for GPU workers

[rueian]

Why are these changes needed?

Continue the work on https://github.com/ray-project/kuberay/issues/2173 for GPU e2e tests.

Related issue number

https://github.com/ray-project/kuberay/issues/2173 for more details.

Checks

• [x] I've made sure the tests are passing.
• Testing Strategy
  • [x] Unit tests
  • [x] Manual tests
  • [ ] This PR is not tested :(