Raise new InternalEvent when user expands settings panel

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/146699



Merged-by: Phil Hughes <me@iamphill.com>
Approved-by: Thomas Hutterer <thutterer@gitlab.com>
Approved-by: Phil Hughes <me@iamphill.com>
Reviewed-by: Sam Beckham <sbeckham@gitlab.com>
Reviewed-by: Sebastian Rehm <srehm@gitlab.com>
Co-authored-by: Jeff Tucker <jtucker@gitlab.com>