Merge branch '474913-hierarchy-widget-rollups-count-badge-hover' into 'master'

Work item rolled up count by type

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/162522



Merged-by: Florie Guibert <fguibert@gitlab.com>
Approved-by: Nick Brandt <nbrandt@gitlab.com>
Approved-by: Rajan Mistry <rmistry@gitlab.com>
Approved-by: Florie Guibert <fguibert@gitlab.com>
Reviewed-by: Heinrich Lee Yu <heinrich@gitlab.com>
Reviewed-by: Florie Guibert <fguibert@gitlab.com>
Reviewed-by: Rajan Mistry <rmistry@gitlab.com>
Co-authored-by: Deepika Guliani <dguliani@gitlab.com>