[Design kit]: Update informational notification

[oliviaflory]

Update Informational notifications to include info icon

Current

Update

All states

• [ ] inline / high contrast

• [ ] multi line / high contrast

• [ ] toast / high contrast

• [ ] inline / low contrast

• [ ] multi line / low contrast

• [ ] toast / low contrast

All themes

• [x] white
• [x] gray 10
• [x] gray 90
• [x] gray 100