Rudder

See #18015 for more context.

We have an error at technique creation:

Could not create ncf technique <- An error occured during technique update after files were created for ncf Technique Package Absent <- Unexpected: Accumulated: Error when automatically activating technique 'Package_Absent'; cause was: Consistancy: Can not add a technique with id 'Package_Absent' in user library. active technique 'activeTechniqueId=cfc7f8d8-3fff-4935-9874-e71890e7fd9e,techniqueCategoryId=ncf_techniques,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration}' is already defined with such a reference technique.

But the technique still appears in editor. It must not in that case.

The error message need to be corrected, too:

- never speak about ncf technique. Just technique.
- add: "You can clean up a technique by deleting it here, and then go to 'settings > active tree', select technique, and click 'delete'"