Go back to the assumption that we *will* produce a block

This is consistent with compatible. The test will also never work if we
don't produce blocks. We should fix that instead.

buildkite/scripts/rosetta-integration-tests.sh

@@ -252,10 +252,10 @@ fi
 
 mina client status --json
 
-next_block_time=$(mina client status --json | jq '.next_block_production.timing[1]' | tr -d '"') curr_time=$(date +%s%N | cut -b1-13)
-sleep_time=$((($next_block_time - $curr_time) / 10000000))
+next_block_time=$(mina client status --json | jq '.next_block_production.timing[1].time' | tr -d '"') curr_time=$(date +%s%N | cut -b1-13)
+sleep_time=$((($next_block_time - $curr_time) / 1000))
 echo "Sleeping for ${sleep_time}s until next block is created..."
-sleep $sleep_time
+sleep ${sleep_time}
 
 # Mina Rosetta Checks (spec construction data perf)
 echo "============ ROSETTA CLI: VALIDATE CONF FILE ${ROSETTA_CONFIGURATION_FILE} =============="