Merge branch '378544-mvc-collapsed-state-for-navigation-redesign' into 'master'

Initialise collapsible super sidebar

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/110868



Merged-by: Mark Florian <mflorian@gitlab.com>
Approved-by: Lukas 'Eipi' Eipert <leipert@gitlab.com>
Approved-by: Nick Brandt <nbrandt@gitlab.com>
Approved-by: Mark Florian <mflorian@gitlab.com>
Reviewed-by: Lukas 'Eipi' Eipert <leipert@gitlab.com>
Reviewed-by: Mark Florian <mflorian@gitlab.com>
Reviewed-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Reviewed-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>