Re-import chosen relation between between source and destination project when migrating by direct transfer
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Problem
When importing projects with a large relation (a lot of MRs or issues in a project), part of the relation items might not get imported (some MRs are not imported). At the moment user can:
- Retry importing the full project (aka create another copy of the project) and hope that this time all relation items get migrated
- Use Single Relation Endpoint. This however doesn't support user contribution mapping for regular users (only for admin users). The process of using the endpoint is cumbersome and manual. For example, users must manually export the project using file-based export or the Direct Transfer Relations API. In the latter case, users must manually create a file compatible with the Single Relation Endpoint and import that file via the endpoint.
None of them is time-efficient and a good UX.
Proposed solution
When some relation items (e.g. MRs) don't get migrated, user should be able to:
- See clearly feedback, that a specific MR could not be imported, because of e.g. it cannot be written to DB due to not meeting validations (it's not possible to import it at all, so it doesn't make sense to retry)
- Or re-import the previously failed to be imported relation items (or the whole relation) to the same project on destination, so that the project on destination has all MRs (same state as on source). The contribution mapping should apply. Only destination project Owners could re-import.
The assumption is that this functionality in UI would rely on an API endpoint, so the first iteration of this feature could be exposing that endpoint. Unless that technically not a good idea.
Technical details
Documentation
Extended endpoints needs to be documented.
User documentation updated.
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