Draft: Removes checkbox disable logic when returning to import from external repo

Mehul Sharmarequested to merge
mehulsharma/gitlab:359786-remove-checkbox-disable into master

What does this MR do and why?

Removes the checkbox disable logic from

/gitlab/ee/app/views/shared/ee/_import_form.html.haml
/gitlab/app/assets/javascripts/projects/project_new.js

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