Upgrade to Cypress 10 (#9008)

* Upgrade to Cypress 10

* Remove stale comment

cypress/support/e2e.ts

@@ -0,0 +1,35 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/// <reference types="cypress" />
+
+import "@percy/cypress";
+import "cypress-real-events";
+
+import "./performance";
+import "./synapse";
+import "./login";
+import "./labs";
+import "./client";
+import "./settings";
+import "./bot";
+import "./clipboard";
+import "./util";
+import "./app";
+import "./percy";
+import "./webserver";
+import "./views";
+import "./iframes";