perf: add PostgreSQL performance flags for CI tests #3424
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Summary
What these flags do
fsync=off- Don't wait for writes to hit disksynchronous_commit=off- Don't wait for WAL flushfull_page_writes=off- Skip extra safety writesThese are safe for tests since we don't need durability.
Expected Impact
5-10% faster database writes in CI tests.
Test plan
Closes ENG-281