fix(check): Adjust format of 'rustup check' to be like Cargo

[epage]

Discussed at #t-rustup > rustup/cargo output format consistency @ 💬

[epage]

Overall, I'm mixed on the results and can see this going one in several directions

[djc]

Overall, I'm mixed on the results and can see this going one in several directions

Can you elaborate? What do you like/don't like? What potential directions do you see?

[epage]

• Update available causes the rest of the messages to be indented by quite a bit
• Except for Checking, these are descriptions rather than verbs