[generators/input-validators] add warranty: optional in...

[generators/input-validators] add warranty: optional in schema-network_equipments.yaml, Bug #8529 - ref-repo - ajout d'un champ warranty: pour les équipements réseaux

generators/input-validators/schema-network_equipments.yaml

 ---
 model: string
+warranty: optional
 kind: string
 serial: optional_string
 site: string