Error message not displayed when trying to save new workflow with existing title

[solth]

Describe the bug
When trying to save a new workflow with the title of an already existing workflow, an error message is added to the internal logging files. On the frontend however, no corresponding message is displayed to the user. Instead, the user is redirected to the worfklow list and it seems like the workflow has been saved correctly.

To Reproduce
Steps to reproduce the behavior:

1. Go to the "Workflows" tab on the "Projects" list page
2. Create new workflow
3. Add the title of an already existing workflow
4. Click save

Expected behavior
When the user tries to save a new workflow with the title of an existing workflow, an corresponding error message should be displayed and the browser should stay in the workflow editor instead of redirecting the user to the workflow list.

Release
3.7.x, 3.8.x, main branch

Additional context
Similar to #6281

(partial) stack trace from log file:

[ERROR] 2024-12-19 08:54:53.600 [http-nio-8080-exec-4] WorkflowForm - org.kitodo.data.database.exceptions.DAOException: org.hibernate.exception.ConstraintViolationException: could not execute statement
org.kitodo.data.exceptions.DataException: org.kitodo.data.database.exceptions.DAOException: org.hibernate.exception.ConstraintViolationException: could not execute statement
        at org.kitodo.production.services.data.base.SearchService.save(SearchService.java:302) ~[classes/:?]
        at org.kitodo.production.forms.WorkflowForm.saveWorkflow(WorkflowForm.java:331) ~[classes/:?]
        at org.kitodo.production.forms.WorkflowForm.saveAndRedirect(WorkflowForm.java:151) ~[classes/:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]