Merge branch 'afontaine/highlight-icon-button' into 'master'

Remove tertiary category from collapse button

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/115414



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Sharmad Nachnolkar <snachnolkar@gitlab.com>
Approved-by: Veethika M <6115425-veethika@users.noreply.gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Reviewed-by: Veethika M <6115425-veethika@users.noreply.gitlab.com>
Co-authored-by: Andrew Fontaine <afontaine@gitlab.com>