Add the missing UM_ROLE_NAME_IND index in DB2 script (#4427)

Author: lashinijay

distribution/kernel/carbon-home/dbscripts/db2.sql

@@ -823,6 +823,8 @@ CREATE TABLE UM_HYBRID_ROLE(
     UNIQUE(UM_ROLE_NAME,UM_TENANT_ID,UM_AUDIENCE_REF_ID)
 )/
 
+CREATE INDEX UM_ROLE_NAME_IND ON UM_HYBRID_ROLE(UM_ROLE_NAME)/
+
 CREATE SEQUENCE UM_HYBRID_ROLE_SEQUENCE AS DECIMAL(27,0)
     INCREMENT BY 1
     START WITH 1