Merge branch 'eread/add-requirements-for-private-repositories-for-some-importers' into 'master'

Add requirements for private repositories for import by repo URL

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/152885



Merged-by: Lysanne Pinto <lpinto@gitlab.com>
Approved-by: Ivane Gkomarteli <igkomarteli@gitlab.com>
Approved-by: Justin Ho Tuan Duong <hduong@gitlab.com>
Approved-by: Lysanne Pinto <lpinto@gitlab.com>
Reviewed-by: Evan Read <eread@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>