Unify automatic deletion of trashed content across all apps

[BurntimeX]

The automatic deletion of content located in the trash bin is currently implemented inconsistently across the WoltLab Suite.

Problem

• Automatic trash cleanup exists in Forum, Gallery, Blog, Filebase, and Calendar,
  but is missing in Database and in the Core (Article system).
• Each app currently defines its own setting and its own Cronjob for the deletion process.
• This leads to duplicated logic, inconsistent behavior, and additional maintenance effort.

Proposal

Evaluate whether this functionality can be centralized by introducing:

• A single global setting in the Core for configuring the automatic deletion interval.
• One unified Cronjob in the Core that handles trash cleanup for all apps.

All applications would then use this shared mechanism instead of maintaining separate implementations.

Expected Benefits

• Consistent behavior across all apps
• Reduced redundancy and simplified configuration
• Lower maintenance overhead and fewer potential inconsistencies