Merge branch '356282-work-items-blocked-warning-when-closing' into 'master'

Add confirmation when closing blocked work items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148545



Merged-by: Simon Knox <simon@gitlab.com>
Approved-by: Nick Brandt <nbrandt@gitlab.com>
Approved-by: Rajan Mistry <rmistry@gitlab.com>
Approved-by: Simon Knox <simon@gitlab.com>
Reviewed-by: Simon Knox <simon@gitlab.com>
Reviewed-by: Rajan Mistry <rmistry@gitlab.com>
Co-authored-by: Jack Chapman <jachapman@gitlab.com>