[TASK] Show not empty databases in install tool

This patch enables the visibility of all databases the user has access
to but disables the non empty ones from being chosen.

Resolves: #52585
Releases: 6.2
Change-Id: Ic8b527c5d256e46b99f79c35d236809ce015cbef
Reviewed-on: https://review.typo3.org/24668
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes
Reviewed-by: Thorsten Kahler
Tested-by: Thorsten Kahler
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind