Update followers grid

What does this MR do and why?

• Show bigger user cards
• Migrate classes

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

1. Go to any group member list, for example http://gdk.test:3000/groups/flightjs/-/group_members
2. Follow all the users there
3. Go to your Profile -> Following, http://gdk.test:3000/users/root/following

#469616 (closed)