Merge branch 'fix-participants-grid' into 'master'

Fix participants in sidebar

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/98001



Merged-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Approved-by: Emily Sybrant <esybrant@gitlab.com>
Approved-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>