e2e additional CloudSQLPostgreSQL source scenarios #1306

Job	Run time
build (mysql-plugin)	1h 19m 33s
build (postgresql-plugin)	33m 11s
build (oracle-plugin)	2h 13m 33s
build (mssql-plugin)	1h 17m 43s
build (cloudsql-mysql-plugin)	1h 30m 19s
build (cloudsql-postgresql-plugin)	58m 45s
	7h 53m 4s

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