fix down script for gp workload (#6678)

Author: vikramdevtron

scripts/sql/33503700_gpu_workload_chart.down.sql

@@ -1,3 +1,5 @@
 DELETE FROM global_strategy_metadata_chart_ref_mapping WHERE chart_ref_id=(select id from chart_ref where version='4.21.0' and name='GPU-Workload');
 
-DELETE FROM "public"."chart_ref" WHERE ("location" = 'gpu-workload-4-21-0' AND "version" = '4.21.0');
+DELETE FROM "public"."chart_ref" WHERE ("location" = 'gpu-workload-4-21-0' AND "version" = '4.21.0');
+
+DELETE FROM chart_ref_metadata WHERE chart_name like 'GPU-Workload';