Support partial clones with SSH transports

While the HTTP upload_pack service already honors the UploadPackFilter feature flag to enable partial clones, the SSH sibling doesn't. As a result, partial clones are unsupported via SSH even if the feature flag is enabled.

Fix the gap between both services by passing both uploadpack.allowFilter and uploadpack.allowanySHA1InWant to git-upload-pack(1), same as for the HTTP service.