fix: RayServe script name mismatch in Dockerfile

[charan-amzn]

What does this PR do?

In Inference module, within Stable diffusion on GPU blueprint, RayServe FastAPI function is of different name than that of what's in pre-built image. So either file name for RayServe script has to be changed to that of what's in Docker image in Public ECR DoEKS repository or Dockerfile needs to be changed to reference right script name. This PR is intended to take latter approach in modifying Dockerfile, so users using blueprint will be able to build own image that references correct script

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Motivation

Encountered error while following blueprint and hence identified the change necessary

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[vara-bonthu]

LGTM 👍