Merge branch '371252-clone-issue-children' into 'master'

Resolve "Change task parent to new issue when issue is moved"

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141815



Merged-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: Nick Leonard <nleonard@gitlab.com>
Approved-by: Serena Fang <sfang@gitlab.com>
Approved-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Reviewed-by: Mario Celi <mcelicalderon@gitlab.com>
Reviewed-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Co-authored-by: Mario Celi <mcelicalderon@gitlab.com>