[FE, Improve provisioning] Create a form to create a new group
Create a form based on the used here: groups/new.html.haml -> groups/_new_group_fields.html.haml -> shared/_group_form.html.haml to create a new group, submitting it to the backend, submitting the subscription association (GraphQL), and redirecting to it.
Re-using the existing form might be complex and there are a few subtleties to this form, some or all might be relevant to this. My initial approach would be to have the same form active in both places, to ensure that they stay aligned. Copying it adds risk, but might be easier.
See details in epic: &6568
cc: @teresatison
Edited by Teresa Tison