[Bug]: Investigate why IdenticalSubmissionsShouldCompleteAndNotHangTheBuildOnMissingTargetExceptions started failing

### Issue Description

The test started failing on PR CI pipeline. Suspecting timing issues.

### Steps to Reproduce

https://dev.azure.com/dnceng-public/public/_build/results?buildId=414226&view=results

### Expected Behavior

Test is reliable.

### Actual Behavior

Test fails in PR builds.

### Analysis

_No response_

### Versions & Configurations

_No response_