Display user avatar and content in chat notifications, also display avatar in friend presence notifications

[frenzibyte]

• Addresses Display chat message content in notifications #33945

I wanted to split each change into its own PR, but that causes stupid dependency chains to occur. So instead, I've grouped everything in this PR, and I'll scratch out any change that's not good.

Before	After

When many users become online/offline at once, the old design is still retained:

[peppy]

Please match osu-web design:

[peppy]

I already said this should match web so I'm not sure why it doesn't.

[frenzibyte]

I'm not quite sure where have you said that. I will match it though.

[peppy]

I'm not quite sure where have you said that. I will match it though.

#33945 (comment)

[frenzibyte]

I'm confused, you're talking about design here, but the issue thread you linked there seems to be about...hooking up web notifications into lazer? I don't understand the relation.

[peppy]

You're implementing something bypassing the larger task, which is to make notifications match osu-web.

If you're going to bypass that task, then at very least make them look the same. So we don't have to redo the redo again and again.