test: Stack Scroll, Right-click to zoom, Middle-click to Pan (#1073)

* E2E tests: Stack Scroll, Right-click to zoom, Middle-click to Pan

* About modal tests and added some cypress selectors

* Checking app version number

* Removed accidental import

* Review fixes

platform/viewer/src/components/Header/Header.js

@@ -105,6 +105,7 @@ class Header extends Component {
             className={`${
               this.props.home ? 'header-versionInfoHome' : 'header-versionInfo'
             }`}
+            data-cy="header-version-info"
           >
             v{process.env.VERSION_NUMBER}
           </span>