[TASK] Upgrade Wizard for FAL references, check for missing tables

In case sys_file_reference contains references to tables that no longer
exist physically (i.e. for extensions that were deinstalled and tables
then deleted through "Database Compare"), the sys_reference_table
upgrade wizard now no longer fails with an exception. Instead the buggy
rows will be deleted from the table.

Resolves: #53650
Releases: 6.2
Change-Id: I6a95b4abef77848de3ed97a1cf9b212434be7c98
Reviewed-on: https://review.typo3.org/25414
Reviewed-by: Wouter Wolters
Reviewed-by: Markus Klein
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny