Add key type selection for SSH push mirror

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Proposal

It would appear that GitLab only generates RSA key types when configuring a project push mirror to an endpoint using SSH (ssh://).

It would be nice to enable the selection of different key types when selecting "SSH public key" as the authentication method. Some endpoints/vendors will restrict authentication to particular key types.

As a mockup:

(no parcitular order of key types in this case)