sql: link issue to unimplemented mutations in udfs

Links an issue to the unimplemented errors for mutations in UDFs.

Epic: None
Informs: cockroachdb#87289
Fixes: cockroachdb#99715

Release note: None

Release justification: Changes an existing error message, so change is
not risky.

pkg/sql/opt/optbuilder/builder.go

@@ -299,6 +299,13 @@ func (b *Builder) buildStmt(
 	if b.insideFuncDef {
 		switch stmt := stmt.(type) {
 		case *tree.Select:
+		case tree.SelectStatement:
+		case *tree.Delete:
+			panic(unimplemented.NewWithIssuef(87289, "%s usage inside a function definition", stmt.StatementTag()))
+		case *tree.Insert:
+			panic(unimplemented.NewWithIssuef(87289, "%s usage inside a function definition", stmt.StatementTag()))
+		case *tree.Update:
+			panic(unimplemented.NewWithIssuef(87289, "%s usage inside a function definition", stmt.StatementTag()))
 		default:
 			panic(unimplemented.Newf("user-defined functions", "%s usage inside a function definition", stmt.StatementTag()))
 		}