[TASK] Catch errors when displaying database connections

If TYPO3 is configured to use multiple database connections, the system
information toolbar should display information about each. However,
errors occuring when connecting to the non-essential databases should not
directly result in an exception.

Instead, these exceptions are now caught and the database status displayed
as offline.

Resolves: #89831
Releases: master
Change-Id: I52fa2df01b23ac005b63b21bc8d7b11a294ec46f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63796


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>