Add `cypress-real-events` library (#16033)

* Install `cypress-real-events` library

* Register `cypress-real-events` globally

frontend/test/__support__/e2e/cypress.js

 import "@testing-library/cypress/add-commands";
+import "cypress-real-events/support";
 import "@cypress/skip-test/support";
 import "./commands";
 

package.json

@@ -115,6 +115,7 @@
     "concurrently": "^3.1.0",
     "css-loader": "^0.28.7",
     "cypress": "^6.8.0",
+    "cypress-real-events": "^1.4.0",
     "documentation": "^4.0.0-rc.1",
     "eslint": "7.12.1",
     "eslint-import-resolver-webpack": "^0.8.3",

yarn.lock

@@ -4302,6 +4302,11 @@ cyclist@^1.0.1:
   resolved "https://registry.yarnpkg.com/cyclist/-/cyclist-1.0.1.tgz#596e9698fd0c80e12038c2b82d6eb1b35b6224d9"
   integrity sha1-WW6WmP0MgOEgOMK4LW6xs1tiJNk=
+cypress-real-events@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/cypress-real-events/-/cypress-real-events-1.4.0.tgz#39575031a4020581e0bbf105d7a306ee57d94f48"
+  integrity sha512-1s4BQN1D++vFSuaad0qKsWcoApM5tQqPBFyDJEa6JeCZIsAdgMdGLuKi5QNIdl5KTJix0jxglzFJAThyz3borQ==
+
 cypress@*, cypress@6.8.0, cypress@^6.8.0:
   version "6.8.0"
   resolved "https://registry.yarnpkg.com/cypress/-/cypress-6.8.0.tgz#8338f39212a8f71e91ff8c017a1b6e22d823d8c1"