Closes #10425

Changes made

• Adds AvatarCard component
• Adds ability to query all groups for a specific user
• Fixes up some of the accessibility issues around how we've been using image alt text
• Renders a user's groups to the Accounts page via AvatarCard

Other notes

• One thing I've noticed is that the base <MUIAvatar> component doesn't work super well with the emoji icons, funnily enough because they're "too" perfectly square. MUI takes the images and sands off the corners via borderRadius, making the icons always look funny
  • Ideally, there'd be a way to detect when we have an emoji icon, and shrink it down so that the image isn't cut up
  • Need to ask if the emoji have a common URL that we could maybe use. Maybe there's a way to sneak that logic into this PR?
  • This issue also affects every single component already using <MUIAvatar>, sadly