[TASK] Improve mocking in ConnectionTest to prepare for dbal 2.11

The tests need some stuff from the constructor to not throw errors now,
so the mock got the required objects.

Resolves: #92452
Releases: master, 10.4
Change-Id: Ibc5c6d6ce513d8d8247185710d43e481cf873ba7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65964


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Benni Mack <benni@typo3.org>