Icon Library: Update Figma icons

[jessicawoodin]

After the icons are updated in the Assets package, we need to update the icons in the Figma icon library.

To dos

• [x] Create branch to update icons
• [x] Update all icons with VADS icons
• [x] Publish updates
• [x] Update icons used in components
  • [x] Loading indicator
  • [x] Snackbar
  • [x] Alert
  • [x] Link
• [x] Notify the UX team (Brea will need to update flagship files)