Update format and autofill for file upload section of group import

Problem to solve

Currently, after the user uploads a file the user must manually enter the Group name and Group URL.

Opportunity

We should autofill the Group name and Group URL based on the file name, or JSON file if this is possible. This will create a more streamlined experience for the user allowing them to import the file quickly. This change will also lessen the chance of error if the user accidentally enters incorrect information.

Proposal

1. Update the layout so the user uploads a file as the first step.
2. Autofill Group name and Group URL based on the file name, or JSON file if this is possible.