Removing snapshot for CDAP 6.11.1.1 release #1732

Job	Run time
build (cloudsql-mysql-plugin)	1h 3m 56s
build (oracle-plugin)	12m 7s
build (postgresql-plugin)	32m 38s
build (mysql-plugin)	1h 13m 35s
build (mssql-plugin)	1h 13m 9s
build (cloudsql-postgresql-plugin)	5m 40s
	4h 21m 5s

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