Renaming an application should not automatically change the slug of that application

**Is your feature request related to a problem? Please describe.**
When renaming an application, the slug of said application also gets changed. This is also the case for existing applications. This results in errors e.g. with OIDC-applications because the path becomes invalid. The change of the slug is easy to miss as there is no separate indication.

**Describe the solution you'd like**
Changing the slug should be opt-in and not be done automatically. Ideally there would be a button that allows/disallows the change of the slug.

**Describe alternatives you've considered**
Alternatively there should be a clear indication, that the slug will also be changed, e.g. with a hint-field or by making the slug-field red. The new slug is already visible, but I didn't see it at the time.