[release/8.0-staging] Disable tests parallelization in flaky OleDB tests #119627
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Backport of #119018 to release/8.0-staging
/cc @roji
Customer Impact
This is a test-only change to fix test flakiness. No product code is affected.
Regression
Testing
No added testing as this is a test-only concurrency fix.
Risk
Zero, no product code changes.