Work Items - CSV export / import
See https://gitlab.com/gitlab-org/gitlab/-/issues/373906 and https://gitlab.com/gitlab-org/gitlab/-/merge_requests/99079 for a spike on this.
Support export and import via CSV of Work Items and widgets.
considerations:
- licensing
- performance
- error handling
- security
Handling licenses - we might want to be consistent with ~"group::import" which imports everything and just doesn't display unlicensed data (https://gitlab.com/gitlab-org/gitlab/-/merge_requests/99079#note_1149252128) :point_right: https://docs.gitlab.com/ee/user/project/settings/import_export.html#between-ce-and-ee
epic