[testcore] Use a single shared cluster for everything#10979
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Combine with the worker-enabled-by-default experiment: keep the system worker on for all pooled clusters, but shrink the shared pool to a single cluster so far fewer clusters run concurrently. Measures whether the single-shared-cluster change offsets the worker's memory impact. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What changed?
Experiment to try and see if we can reuse a single shared cluster for all tests that request a shared cluster.
Why?
Reduce memory usage of tests.
How did you test it?
Potential risks
Need to watch out if it increases flakes.