[BUGFIX] Fix ExpressionBuilder->inSet for PostgreSQL

Disable treating the generated SQL fragment as a field name to avoid
quoting the whole fragment.

Tests for the MySQL and PostgreSQL versions of the statement have been
added.

Resolves: #75635
Releases: master
Change-Id: If15199032e905f7b2a1ca53bfc654d07038cd54a
Reviewed-on: https://review.typo3.org/47681


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Richard Haeser <richardhaeser@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>