3364 del wsp
This MR adds the delete workspace functionality to the presets-backend:
- A user can delete his/her own (user) workspacepresets.
- A user cannot delete a user workspace preset belonging to a different user.
- A user cannot delete a system preset.
to test:
- run the presets-backend locally according to https://gitlab.com/opengeoweb/backend-services/presets-backend/-/blob/main/README.md
- test adding and deleting workspace_presets by using the Swagger interface at http://localhost:8080/docs