test(e2e-cypress): fix all failing tests for this script

Problem was with an obsolete and no longer supported
Perf tool for React. Reference to it have been removed.

Refs #7341

src/core/index.js

@@ -6,10 +6,6 @@ import AllPlugins from "./plugins/all"
 import { parseSearch } from "./utils"
 import win from "./window"
 
-if (process.env.NODE_ENV !== "production" && typeof window !== "undefined") {
-  win.Perf = require("react-dom/lib/ReactPerf")
-}
-
 // eslint-disable-next-line no-undef
 const { GIT_DIRTY, GIT_COMMIT, PACKAGE_VERSION, HOSTNAME, BUILD_TIME } = buildInfo