Breaking: #97151 - Remove "Database Relations" backend module 

Description 

The backend sub-module "Database Relations" within "DB Check" aims to provide information about potentially broken database relations. The information it gives is really sparse and barely helpful, also the whole module and its code received no meaningful updates in the past.

Due to this, the module has been removed.

Impact 

The module has been removed. Links and stored bookmarks will not work anymore.

Affected installations 

All TYPO3 installations are affected.

Migration 

There is no migration available.