feat: add more e2e tests for MPR and add test mode and extension (#3180)

* tests: add various e2e tests for MPR and measurements

wip

add cypress config

feat: add mode and extension for testing

add hp applied through search params

add MPR tests

apply review comments

add more e2e tests

update yarn lock

* fix unit tests failing

extensions/test-extension/src/id.js

@@ -0,0 +1,5 @@
+import packageJson from '../package.json';
+
+const id = packageJson.name;
+
+export { id };

extensions/test-extension/src/index.tsx

@@ -0,0 +1,17 @@
+import { id } from './id';
+import { Types } from '@ohif/core';
+
+/**
+ *
+ */
+const testExtension: Types.Extensions.Extension = {
+  /**
+   * Only required property. Should be a unique value across all extensions.
+   */
+  id,
+  preRegistration() {
+    console.debug('hello from test-extension init.js');
+  },
+};
+
+export default testExtension;