clean up samples, update test spec (cpp-restsdk) (#18675)

modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml

@@ -725,55 +725,49 @@ components:
             - available
             - pending
             - sold
-
+      xml:
+        name: Pet
+    ApiResponse:
+      title: An uploaded response
+      description: Describes the result of uploading an image resource
+      type: object
+      properties:
+        code:
+          type: integer
+          format: int32
+        type:
+          type: string
+        message:
+          type: string
+    SchemaWithSet:
+      description: Schema with a set property
+      type: object
+      properties:
         certificates:
           description: pedigree and other certificates
           type: array
           uniqueItems: true
-
           items:
             type: string
-
         vaccinationBook:
           description: Vaccination book of the pet
           type: object
-
           required:
             - vaccines
-
           properties:
             vaccines:
               type: array
               uniqueItems: true
-
               items:
                 title: vaccine
                 type: object
-
                 required:
                   - date
                   - boosterRequired
-
                 properties:
                   date:
                     format: date
                     description: vaccination date
-
                   boosterRequired:
                     type: boolean
                     description: true if a booster is still needed to complete the vaccination
-
-      xml:
-        name: Pet
-    ApiResponse:
-      title: An uploaded response
-      description: Describes the result of uploading an image resource
-      type: object
-      properties:
-        code:
-          type: integer
-          format: int32
-        type:
-          type: string
-        message:
-          type: string