Add cleanup to new test cases

src/test/modules/dummy_seclabel/expected/dummy_seclabel.out

@@ -111,5 +111,7 @@ NOTICE:  event ddl_command_end: SECURITY LABEL
 DROP EVENT TRIGGER always_start, always_end, always_drop, always_rewrite;
 DROP VIEW dummy_seclabel_view1;
 DROP TABLE dummy_seclabel_tbl1, dummy_seclabel_tbl2;
+DROP SUBSCRIPTION dummy_sub NODROP SLOT;
+DROP PUBLICATION dummy_pub;
 DROP ROLE regress_dummy_seclabel_user1;
 DROP ROLE regress_dummy_seclabel_user2;

src/test/modules/dummy_seclabel/sql/dummy_seclabel.sql

@@ -108,5 +108,8 @@ DROP EVENT TRIGGER always_start, always_end, always_drop, always_rewrite;
 DROP VIEW dummy_seclabel_view1;
 DROP TABLE dummy_seclabel_tbl1, dummy_seclabel_tbl2;
 
+DROP SUBSCRIPTION dummy_sub NODROP SLOT;
+DROP PUBLICATION dummy_pub;
+
 DROP ROLE regress_dummy_seclabel_user1;
 DROP ROLE regress_dummy_seclabel_user2;