e2e mysql source additional tests #1151

Job	Run time
build (mysql-plugin)	1h 34m 23s
build (postgresql-plugin)	32m 15s
build (oracle-plugin)	2h 2m 31s
build (mssql-plugin)	1h 19m 19s
build (cloudsql-mysql-plugin)	1h 15m 37s
build (cloudsql-postgresql-plugin)	6m 32s
	6h 50m 37s

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