[Simtest] reduce surfer traffic and increase simtest nightly timeout #17599
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Description
Simtest has been timing out for awhile, because of increased transaction workload. Reducing the transactions sent from Sui surfer and increase simtest nightly timeout.
Test plan
CI
https://github.com/MystenLabs/sui/actions/runs/9012876888: probably will be cancel by other runs, but worth checking if it is taking too long.
Release notes
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