fix(e2e): update of openapi inheritance for portal navigation items

Author: dev-marek

gravitee-apim-rest-api/gravitee-apim-rest-api-portal/gravitee-apim-rest-api-portal-rest/src/main/resources/portal-openapi.yaml

@@ -6304,10 +6304,6 @@ components:
                 title:
                     type: string
                     description: The title of the navigation item
-                type:
-                    type: string
-                    description: The type of the navigation item
-                    enum: [PAGE, FOLDER, LINK]
                 area:
                     $ref: "#/components/schemas/PortalArea"
                 parentId:
@@ -6317,12 +6313,6 @@ components:
                     type: integer
                     description: The order of the navigation item
             required: [id, organizationId, environmentId, title, type, area, order]
-            discriminator:
-                propertyName: type
-                mapping:
-                    PAGE: "#/components/schemas/PortalNavigationPage"
-                    FOLDER: "#/components/schemas/PortalNavigationFolder"
-                    LINK: "#/components/schemas/PortalNavigationLink"
         PortalNavigationPage:
             allOf:
                 - $ref: "#/components/schemas/BasePortalNavigationItem"
@@ -6343,6 +6333,11 @@ components:
                           description: The URL for the link
                   required: [url]
         PortalNavigationItem:
+            properties:
+                type:
+                    type: string
+                    description: The type of the navigation item
+                    enum: [PAGE, FOLDER, LINK]
             oneOf:
                 - $ref: "#/components/schemas/PortalNavigationPage"
                 - $ref: "#/components/schemas/PortalNavigationFolder"