Merge branch 'related-items-tree-new-card' into 'master'

Related items tree: Replace gl-new-card-body naming with crud-body

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167758



Merged-by: Kushal Pandya <kushal@gitlab.com>
Approved-by: Kushal Pandya <kushal@gitlab.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>