[Prettier Plugin] Automatically apply upgrade migrations

[aaronadamsCA]

I'd like the Prettier plugin to automatically run the same design system–driven migrations as the upgrade utility (#17831).

That way, if I have styles that could be written in a simpler way, Prettier can simplify them for me.

[philipp-spiess]

@aaronadamsCA We've been thinking about this but the issue right now is that these design-system driven migrations are relatively complex to compute and Prettier needs to be able to process the whole document in a very limited amount of time :/