[Feature Request] Remove orphaned webhooks

[D0wn3r]

Is your feature request related to a problem? Please describe

Hi Portainer team and community!

When we delete a stack that has webhooks on services, those webhooks are not deleted and unfortunately become orphaned.

Describe the solution you'd like

To keep things cleaner, all webhooks associated with a deleted stack should also be deleted.

Describe alternatives you've considered

Nothing

Additional context

No response