Fix bug when project export to remote url fails
What does this MR do?
When a project export to a remote url fails, we call the method dig on a HTTParty::Response object. But, this object doesn't have that method.
In this MR we remove that call.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60827
Does this MR meet the acceptance criteria?
Conformity
Edited by Francisco Javier López (ex-Gitlab)