Merge branch 'leipert-remove-more-header-bar-layout' into 'master'

Remove a few elements from the legacy header layout

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138837



Merged-by: Illya Klymov <xanf@xanf.me>
Approved-by: Ian Baum <ibaum@gitlab.com>
Approved-by: Douglas Barbosa Alexandre <dbalexandre@gmail.com>
Approved-by: Illya Klymov <xanf@xanf.me>
Approved-by: Thomas Hutterer <thutterer@gitlab.com>
Reviewed-by: Illya Klymov <xanf@xanf.me>
Reviewed-by: Thomas Hutterer <thutterer@gitlab.com>
Co-authored-by: Lukas Eipert <leipert@gitlab.com>