[BEAM-12044] JdbcIO read: always force autocommit to false

[turb]

According to PostgreSQL JDBC documentation, it is required to disable autocommit in order to allow cursor streaming.

In JdbcIO:1548 we have poolableConnectionFactory.setDefaultAutoCommit(false);, however it is only applicable to poolable datasource. So any other usage will eventually lead to OOM since the JDBC driver silently falls back to full memoization of the request result.

The commit disables autocommit more systematically.

Superseedes #14338

cc @jkff@aromanenko-dev

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Java
Python		---			---		---
XLang		---			---		---

Pre-Commit Tests Status (on master branch)

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Non-portable
Portable	---		---	---	---	---

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[aromanenko-dev]

Thanks for the fix, @turb! LGTM