Turn off randomized tx workload (#20660)

Seems causing high error rate.

## Description 

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## Test plan 

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crates/sui-benchmark/tests/simtest.rs

@@ -1012,7 +1012,7 @@ mod test {
                 shared_deletion_weight: 1,
                 shared_counter_hotness_factor: 50,
                 randomness_weight: 1,
-                randomized_transaction_weight: 1,
+                randomized_transaction_weight: 0,
                 num_shared_counters: Some(1),
                 use_shared_counter_max_tip: false,
                 shared_counter_max_tip: 0,