Form validation on GitLab import takes place before user has chance to enter information
### Summary
When opening the [GitLab Import](https://gitlab.com/import/gitlab_project/new?namespace_id=4799575&name=&path=) page, validation has already taken place upon pageload and marks the `Project slug` field red, even though the user did not have any chance yet to fill it out.
### Steps to reproduce
Open the [GitLab Import](https://gitlab.com/import/gitlab_project/new?namespace_id=4799575&name=&path=) page.
### What is the current *bug* behavior?
`Project slug` field gets a red border upon page load
### What is the expected *correct* behavior?
`Project slug` field only gets highlighted red after submitting a form that misses this field.
### Relevant logs and/or screenshots

issue