Removing snapshot for CDAP 6.11.1.1 release #1731

Job	Run time
build (mssql-plugin)	1h 13m 7s
build (postgresql-plugin)	32m 55s
build (oracle-plugin)	11m 56s
build (mysql-plugin)	1h 12m 24s
build (cloudsql-mysql-plugin)	1h 3m 53s
build (cloudsql-postgresql-plugin)	5m 40s
	4h 19m 55s

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