Error when trying to delete templateProcess used in ImportConfiguration

[solth]

Describe the bug
When a process is configured as templateProcess (see first screenshot) and additionally this "templateProcess" is used as "Default template process" in an ImportConfiguration of type "Process template" (see second screenshot), deleting the process via the bin symbol in the process list results in a generic error messge and leads to a corrupted index, where the process has been removed from the database but not yet from the index.

To Reproduce
Steps to reproduce the behavior:

1. Configure a process as "Template process" (see first screenshot)
2. Create an import configuration of type "Template process" and configure the process of the first step as "Default template process" (second screenshot)
3. Delete process from process list (third screenshot)
4. See error (fourth screenshot)

Expected behavior
Deleting a template process used as "Default template process" should either not be possible (display a corresponding error message to the user before it is deleted from the database, that informs him that this process cannot be removed because it is used in an ImportConfiguration) or should update or remove the corresponding ImportConfiguration automatically.

Screenshots
Screenshot 1: Configure process as "template process"

Screenshot 2: Use said process as "Default template process" in corresponding "Import Configuration"

Screenshot 3: Delete process via list action

Screenshot 4: See generic error message

Release
3.8, current main branch