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## Problem Extension tests were previously run sequentially, resulting in unnecessary wait time and underutilization of available CPU cores. ## Summary of changes Tests are now executed in a customizable number of parallel threads using separate database branches. This reduces overall test time by approximately 50% (e.g., on my laptop, parallel test lasts 173s, while sequential one lasts 340s) and increases the load on the pageserver, providing better test coverage. --------- Co-authored-by: Alexander Bayandin <alexander@neon.tech> Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com> Co-authored-by: Alexey Masterov <alexey.masterov@databricks.com>