adjust scan/sequencer rate limits

Pull Request Checklist

bump some rate limits

remove lower overrides for bulk ops as they just call s3 bump some sequencer overrides to better accommodate multiple validators behind one ip

Cluster Testing

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• If a logical synchronizer upgrade test is required (from canton-3.5), comment /lsu_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.

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