Fix raytune_oai_mr_grpc_test test

[sutaakar]

Description

Adjust S3 configuration and test termination condition to successfully test raytune-oai-MR-gRPC-demo.ipynb example.
Depends on project-codeflare/codeflare-common#83

How Has This Been Tested?

Manually by running against OCP.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astefanutti

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