Merge branch 'eread/add-docs-for-accessing-details-of-partially_completed-imports' into 'master'

Add docs for accessing details of partially-completed imports

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144535



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Martin Wortschack <mwortschack@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>