Remove useWysiwyg mock (#9578)

test/setup/setupManualMocks.ts

@@ -16,6 +16,7 @@ limitations under the License.
 
 import fetchMock from "fetch-mock-jest";
 import { TextDecoder, TextEncoder } from "util";
+import fetch from 'node-fetch';
 
 // jest 27 removes setImmediate from jsdom
 // polyfill until setImmediate use in client can be removed
@@ -87,6 +88,8 @@ fetchMock.get("/image-file-stub", "image file stub");
 // @ts-ignore
 window.fetch = fetchMock.sandbox();
 
+window.Response = fetch.Response;
+
 // set up mediaDevices mock
 Object.defineProperty(navigator, "mediaDevices", {
     value: {