Merge branch '494500-show-confidential-nl' into 'master'

Show confidential button in work item action menu when parent is confidential

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168405



Merged-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Ilonah Pelaez <ipelaez@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Co-authored-by: Nick Leonard <nleonard@gitlab.com>