Merge branch '514334-expose-linktype-field-for-linked-work-items' into 'master'

Expose link information in field linkedWorkItems

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/178569



Merged-by: Chad Woolley <cwoolley@gitlab.com>
Approved-by: Michał Zając <mzajac@gitlab.com>
Approved-by: Chad Woolley <cwoolley@gitlab.com>
Reviewed-by: Michał Zając <mzajac@gitlab.com>
Reviewed-by: Chad Woolley <cwoolley@gitlab.com>
Co-authored-by: Eugenia Grieff <egrieff@gitlab.com>