Prefer polymorphism over specific type checks in Import service
The remaining project.gitea_import?
check inside import_repository
will go away in (the CE counterpart to) https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3396.
The remaining project.gitea_import?
check inside import_repository
will go away in (the CE counterpart to) https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3396.