[PLUGIN-1949] Add Oracle UPSERT #1726

Job	Run time
build (oracle-plugin)	14m 10s
build (cloudsql-postgresql-plugin)	1h 7m 2s
build (mysql-plugin)	1h 45m 43s
build (cloudsql-mysql-plugin)	2h 19m 35s
build (mssql-plugin)	2h 15m 26s
build (postgresql-plugin)	1h 4m 5s
	8h 46m 1s

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