e2e mysql source additional tests #1148

Job	Run time
build (mysql-plugin)	3m 1s
build (postgresql-plugin)	33m 25s
build (oracle-plugin)	2h 4m 0s
build (mssql-plugin)	1h 18m 3s
build (cloudsql-mysql-plugin)	1h 15m 12s
build (cloudsql-postgresql-plugin)	7m 33s
	5h 21m 14s

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