Modify fetch usage in tests to conform templates

plugins/catalog-import/package.json

@@ -39,7 +39,6 @@
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.45",
     "@octokit/rest": "^18.0.12",
-    "cross-fetch": "^3.0.6",
     "git-url-parse": "^11.4.3",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
@@ -58,6 +57,7 @@
     "@testing-library/user-event": "^12.0.7",
     "@types/jest": "^26.0.7",
     "@types/node": "^12.0.0",
+    "cross-fetch": "^3.0.6",
     "msw": "^0.21.2"
   },
   "files": [

plugins/catalog-import/src/api/CatalogImportClient.ts

@@ -19,7 +19,6 @@ import { DiscoveryApi, OAuthApi, ConfigApi } from '@backstage/core';
 import { CatalogImportApi } from './CatalogImportApi';
 import { PartialEntity } from '../util/types';
 import { GitHubIntegrationConfig } from '@backstage/integration';
-import fetch from 'cross-fetch';
 
 export class CatalogImportClient implements CatalogImportApi {
   private readonly discoveryApi: DiscoveryApi;

plugins/catalog-import/src/setupTests.ts

@@ -15,3 +15,4 @@
  */
 
 import '@testing-library/jest-dom';
+import 'cross-fetch/polyfill';