D9 User Profile view - Implement sub menu
Once logged in the accounts.eclipse.org, the sub menu is visible on the home page and looks like this:
The main part of the code for the Drupal 7 implementation is located here: https://gitlab.eclipse.org/eclipsefdn/it/webdev/drupal/site_login/-/blob/7.x-4.x/site_login_dashboard/site_login_dashboard.module#L728
Note that we are using drupal_alter() which means we add sub menu items from other modules. Such as the Committer Paperwork List page.