Remove Snapshot for release 1.12.2 database plugins #1478

Job	Run time
build (oracle-plugin)	1h 50m 45s
build (mysql-plugin)	1h 17m 26s
build (postgresql-plugin)	31m 54s
build (cloudsql-postgresql-plugin)	5m 57s
build (mssql-plugin)	1h 16m 9s
build (cloudsql-mysql-plugin)	1h 21m 39s
	6h 23m 50s

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