refactor(media): use UUID instead of ID for media retrieval in GraphQL

Fixes #1760

src/graphql/upload.ts

@@ -3,16 +3,8 @@ import gql from "graphql-tag";
 export const UPLOAD_MEDIA = gql`
   mutation UploadMedia($file: Upload!, $alt: String, $name: String!) {
     uploadMedia(file: $file, alt: $alt, name: $name) {
+      uuid
       url
-      id
-    }
-  }
-`;
-
-export const REMOVE_MEDIA = gql`
-  mutation RemoveMedia($id: ID!) {
-    removeMedia(id: $id) {
-      id
     }
   }
 `;