remove dedicated_executor (#1772)

Author: DanCodedThis

crates/core-executor/src/query.rs

@@ -2223,6 +2223,9 @@ impl UserQuery {
     async fn execute_logical_plan(&self, plan: LogicalPlan) -> Result<QueryResult> {
         let session = self.session.clone();
         let query_id = self.query_context.query_id;
+
+        let span = tracing::debug_span!("UserQuery::execute_logical_plan");
+
         let stream = tokio::task::spawn(async move {
             let mut schema = plan.schema().as_arrow().clone();
             let records = session