e2e mysql source additional tests #1161

Job	Run time
build (mysql-plugin)	1h 34m 23s
build (postgresql-plugin)	33m 39s
build (oracle-plugin)	2h 4m 23s
build (mssql-plugin)	1h 16m 56s
build (cloudsql-mysql-plugin)	1h 13m 2s
build (cloudsql-postgresql-plugin)	6m 36s
	6h 48m 59s

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