Chat sessions view has the same icon as chat

[Tyriar]

Testing #258320

If user has them side-by-side, they look the same in the activity bar

[rebornix]

was the icon for chat view changed recently? I thought we picked the comment intentionally to differentiate with the chat icon @osortega

[osortega]

Changed icon to have the new sparkle discussion one

[aiday-mar]

Verified chat sessions view has double bubble, while chat view has only one.