Create Group Import UI

Goal

To create the functionality to import Group data from the GitLab UI. This should behave in the same way as the existing Project import.

Scope

1. The user can visit New Group > Import Group and upload a GitLab group export file
2. The user is taken to the the new group after submitting the form

Technical Requirements

• Group name is needed to be defined for importing a group.
• Slug
• File

Screenshot of Project import:

Out of Scope

1. Presenting the import in progress screen to the user - this will be completed in: #211808 (closed)