fix(node_framework): Use custom pool for commitiment generator (#2076)

## What ❔

We create a custom pool for commitment generator in
`initialize_components`, but use "global" pool in the framework.

## Why ❔

Align implementations.

## Checklist

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- [ ] Tests for the changes have been added / updated.
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core/node/node_framework/src/implementations/layers/commitment_generator.rs

@@ -30,7 +30,8 @@ impl WiringLayer for CommitmentGeneratorLayer {
 
     async fn wire(self: Box<Self>, mut context: ServiceContext<'_>) -> Result<(), WiringError> {
         let pool_resource = context.get_resource::<PoolResource<MasterPool>>().await?;
-        let main_pool = pool_resource.get().await?;
+        let pool_size = CommitmentGenerator::default_parallelism().get();
+        let main_pool = pool_resource.get_custom(pool_size).await?;
 
         let commitment_generator = CommitmentGenerator::new(main_pool, self.mode);