squash! Skip attempts to create target gp tablespace.

Drop the database and table to fix gpcheckcat.

src/test/isolation2/input/pg_basebackup_with_tablespaces.source

@@ -25,6 +25,8 @@ select count_of_items_in_directory('@testtablespace@/some_isolation2_pg_baseback
 
 -- Cleanup things we've created
 0U: select pg_drop_replication_slot('some_replication_slot');
+drop database some_database_with_tablespace;
+drop tablespace some_isolation2_pg_basebackup_tablespace;
 !\retcode rm -rf @testtablespace@/some_isolation2_pg_basebackup;
 !\retcode rm -rf @testtablespace@/some_isolation2_pg_basebackup_tablespace;
 

src/test/isolation2/output/pg_basebackup_with_tablespaces.source

@@ -54,6 +54,10 @@ select count_of_items_in_directory('@testtablespace@/some_isolation2_pg_baseback
 --------------------------
                           
 (1 row)
+drop database some_database_with_tablespace;
+DROP
+drop tablespace some_isolation2_pg_basebackup_tablespace;
+DROP
 !\retcode rm -rf @testtablespace@/some_isolation2_pg_basebackup;
 -- start_ignore