[TASK] TceformsUpdateWizard: Throw exception if database query fails

Inform the user, if the database SELECT query fails during the wizard.

Resolves: #57572
Releases: 6.2
Change-Id: I0908aff5d58d6d309b471c810d924f26fc1ca577
Reviewed-on: https://review.typo3.org/29093
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Steffen Müller
Tested-by: Steffen Müller