CEC-2579 Add ability to edit manifest (#226)

src/services/__mocks__/manifestsAPI.js

@@ -57,6 +57,13 @@ const manifestsAPI = {
     return { statuses: [] };
   },
 
+  updateManifest: async (id, data, token) => {
+    return {
+      id,
+      ...data,
+    }
+  },
+
   getManifest: async (id, token) => {
     return {
       id,