Fixed validation error when creating new tag from PSM

refs #10438

- Expanded required fields for related tags to have either one of 'id', 'slug' or a 'name' field

core/server/api/v2/utils/validators/input/schemas/posts.json

@@ -155,7 +155,11 @@
                         "maxLength": 24
                     }
                 },
-                "required": ["id"]
+                "oneOf": [
+                    {"required": ["id"]},
+                    {"required": ["name"]},
+                    {"required": ["slug"]}
+                ]
             }
         }
     }