Merge pull request #18234 from backstage/blam/jsdom-env

cli: Add `Request` `Response` `Headers` and `fetch` to `jsdom` environment

plugins/kubernetes/src/setupTests.ts

@@ -16,7 +16,6 @@
 import '@testing-library/jest-dom';
 // eslint-disable-next-line no-restricted-imports
 import { TextDecoder, TextEncoder } from 'util';
-import 'cross-fetch/polyfill';
 
 // These are missing from jest-node, so not available on global.
 Object.defineProperty(global, 'TextEncoder', {