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/components/NoProtectionsNoteWarning.tsx

@@ -16,7 +16,6 @@ function NoProtectionsNoteWarning({ appState, onViewNote }: Props) {
           className="sn-button small info"
           onClick={() => {
             appState.accountMenu.setShow(true);
-            appState.accountMenuReact.setShow(true);
           }}
         >
           Open account menu