Terminal: Smack user in a face with release notes after update

[zawor]

Description of the new feature/enhancement

Smack user in a face with release notes dialog/view/whatever you feel like appropriate after each update. It should be rather opt in feature as I can imagine not everybody wishes to see those.

It should solve (to some extent) situations like #5458 where breaking changes had limited visibility until user got hit with fallout. And those which run on Windows Store version (like I do) and don't hold their hand on the pulse of latest upcoming changes (just like me) were pretty surprised by it.

Proposed technical implementation details (optional)

In perfect world I would love to see it 1-to-1 like VS Code does. Love how they did release notes and call me pervert but I read them from cover to cover every single time. You simply get smacked with new tab with clear and well organized release notes in every time you get updated. I imagine that built in dedicated view like in VS Code may be not quite feasible in reasonable time/budget but opening browser window pointing to release notes will do the job too.

[DHowett-MSFT]

Yeah, we definitely need a better on-upgrade story. I think it'd be really cool if we popped it up in an _actual terminal tab_. Like, using the terminal renderer and stuff.