Fix shared counter workload config creation (MystenLabs#18143)

## Description 

In shared counter workload, when `shared_counter_hotness_factor == 100`,
currently no shared counter is created due to the calculation, even
though the option doc specifies that when hotness factor is 100, we need
to create 1 shared counter and all requests is targeting that counter.

```
        // total_shared_counters = max(1, qps * (1.0 - hotness/100.0))
        shared_counter_hotness_factor: Vec<u32>,
```

This PR also adds shared deletion workload weight in the total weight
calculation in create_workload_builders.

## Test plan 

How did you test the new or updated feature?

---

## Release notes

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crates/sui-benchmark/src/workloads/shared_counter.rs

@@ -100,9 +100,11 @@ impl SharedCounterWorkloadBuilder {
         let max_ops = target_qps * in_flight_ratio;
         let shared_counter_ratio =
             1.0 - (std::cmp::min(shared_counter_hotness_factor, 100) as f32 / 100.0);
-        let num_shared_counters =
-            num_shared_counters.unwrap_or((max_ops as f32 * shared_counter_ratio) as u64);
-        if num_shared_counters == 0 || num_workers == 0 {
+        let num_shared_counters = num_shared_counters.unwrap_or(std::cmp::max(
+            1,
+            (max_ops as f32 * shared_counter_ratio) as u64,
+        ));
+        if max_ops == 0 || num_shared_counters == 0 || num_workers == 0 {
             None
         } else {
             let workload_params = WorkloadParams {

crates/sui-benchmark/src/workloads/shared_object_deletion.rs

@@ -142,8 +142,8 @@ impl SharedCounterDeletionWorkloadBuilder {
         let max_ops = target_qps * in_flight_ratio;
         let shared_counter_ratio =
             1.0 - (std::cmp::min(shared_counter_hotness_factor, 100) as f32 / 100.0);
-        let num_shared_counters = (max_ops as f32 * shared_counter_ratio) as u64;
-        if num_shared_counters == 0 || num_workers == 0 {
+        let num_shared_counters = std::cmp::max(1, (max_ops as f32 * shared_counter_ratio) as u64);
+        if max_ops == 0 || num_shared_counters == 0 || num_workers == 0 {
             None
         } else {
             let workload_params = WorkloadParams {

crates/sui-benchmark/src/workloads/workload_configuration.rs

@@ -156,6 +156,7 @@ impl WorkloadConfiguration {
         system_state_observer: Arc<SystemStateObserver>,
     ) -> Vec<Option<WorkloadBuilderInfo>> {
         let total_weight = shared_counter_weight
+            + shared_deletion_weight
             + transfer_object_weight
             + delegation_weight
             + batch_payment_weight