Enable xml type support for oracle for dts-connectors only #1783

Job	Run time
build (postgresql-plugin)	47m 45s
build (cloudsql-mysql-plugin)	1h 56m 59s
build (oracle-plugin)	2h 35m 31s
build (cloudsql-postgresql-plugin)	51m 57s
build (mysql-plugin)	1h 18m 24s
build (mssql-plugin)	1h 40m 22s
	9h 10m 58s

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