Support SSH keys for project import repo by URL
Problem to solve
Currently, importing a project from repo by URL does not support using SSH keys for authentication.
Further details
Customer requesting this --> https://gitlab.zendesk.com/agent/tickets/106835 (internal use only)
"Allow SSH keys to be used for project import, not just mirroring an existing project"
This customer cannot import via HTTPS because of issue #25778 (moved)
Proposal
What does success look like, and how can we measure that?
Projects can be imported from repo by URL using SSH keys for authentication.