chore: cleanup error messages

Author: mohammadnaqvi04

datafusion/optimizer/src/decorrelate.rs

@@ -622,7 +622,7 @@ fn remove_duplicated_filter(
             Expr::BinaryExpr(b) => b.op.swap() == Some(b.op),
             _ => true,
         },
-        "remove_duplicated_filter: in_predicate must use a commutative operator"
+        "in_predicate must use a commutative operator"
     );
 
     Ok(filters

datafusion/optimizer/src/decorrelate_predicate_subquery.rs

@@ -759,9 +759,7 @@ fn build_join_with_count_bug(
             .project(left_projection)?
             .build()?,
         _ => {
-            return internal_err!(
-                "build_join_with_count_bug: unsupported join type {join_type:?}"
-            );
+            return internal_err!("unsupported join type {join_type:?}");
         }
     };