[BUGFIX] Fix functional tests for EXT:core on PostgreSQL

Fix reliance on MySQLs implicit secondary ordering by uid within
DataHandler.

Reset sequenced on non-MySQL database platforms.

Sort expected results retrieved from the database and switch to using
assertEquals() to avoid string/int type differences in result rows
due to different drivers.

Change-Id: I95a8cdb81dbbdb6c4bcf2c6c9ad9f0e5f9ae44fe
Resolves: #79672
Releases: master
Reviewed-on: https://review.typo3.org/51664


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Manuel Selbach <manuel_selbach@yahoo.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>