fix: Investigate Getter RACE and Evict Batch flaky tests

[martinconic]

Checklist

• [ ] I have read the coding guide.
• [ ] My change requires a documentation update, and I have done it.
• [ ] I have added tests to cover my changes.
• [ ] I have filled out the description and linked the related issues.

Description

Investigation and improvements for Getter RACE and Evict Batch flaky tests.

Open API Spec Version Changes (if applicable)

Motivation and Context (Optional)

Related Issue (Optional)

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