CNDB-12297: Fix flaky test MutatorTest.testMutatateAtomically by polling for async batchlog removal #1485
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What is the issue
The test asserts that the batchlog is removed immediately after the write completes, but removal of the batchlog is async and can be delayed, particularly in resource-limited environments like CI.
What does this PR fix and why was it fixed
Poll for batchlog removal, giving the async process time to complete.
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