refactor: migrate account-menu to react - implement functionality

- remove all Angular code related to `account-menu`
- rename React component to AccountMenu so that many parts of old code remain unchanged
- code cleanup

app/assets/javascripts/directives/views/index.ts

@@ -1,4 +1,3 @@
-export { AccountMenu } from './accountMenu';
 export { ActionsMenu } from './actionsMenu';
 export { ComponentModal } from './componentModal';
 export { ComponentView } from './componentView';