Wrap form into card element

What does this MR do and why?

Wrap form into card element

Related to #367105 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

To view the page in GDK, use the following URL pattern, where your-group would be replaced with a group you have locally:

http://127.0.0.1:3000/-/subscriptions/groups/your-group/edit

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.