Revert "Merge branch 'winh-fix-flaky-dashboard_spec' into 'master'"

This reverts merge request !32571

spec/frontend/environment.js

@@ -40,7 +40,6 @@ class CustomEnvironment extends JSDOMEnvironment {
 
     this.global.fixturesBasePath = `${ROOT_PATH}/tmp/tests/frontend/fixtures${IS_EE ? '-ee' : ''}`;
     this.global.staticFixturesBasePath = `${ROOT_PATH}/spec/frontend/fixtures`;
-    this.global.IS_EE = IS_EE;
 
     // Not yet supported by JSDOM: https://github.com/jsdom/jsdom/issues/317
     this.global.document.createRange = () => ({

spec/frontend/test_setup.js

@@ -73,9 +73,6 @@ expect.extend(customMatchers);
 // Tech debt issue TBD
 testUtilsConfig.logModifiedComponents = false;
 
-// Stub for URL.createObjectURL
-window.URL.createObjectURL = function createObjectURL() {};
-
 // Basic stub for MutationObserver
 global.MutationObserver = () => ({
   disconnect: () => {},