[e2e] Reduce state sync delay #296
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Resolves: #293
Theory:
sync_concurrentcouldn't finish because the number of ranges it needs to fetch + change proofs is greater than the default parallelism setting (which means fetching takes ~>200ms but the block time is 250ms).We want to make sure we can update the root before sync finishes but don't want the node to be unable to catch up.