fix(cubesql): Add forgotten Distinct in ast_size_outside_wrapper cost component (#8882)

Author: mcheshkov

rust/cubesql/cubesql/src/compile/rewrite/cost.rs

@@ -495,6 +495,7 @@ impl CostFunction<LogicalPlanLanguage> for BestCubePlan {
             LogicalPlanLanguage::Union(_) => 1,
             LogicalPlanLanguage::Window(_) => 1,
             LogicalPlanLanguage::Subquery(_) => 1,
+            LogicalPlanLanguage::Distinct(_) => 1,
             _ => 0,
         };