Use atty crate instead of rolling our own #80888
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Area: rustc_driver that ties everything together into the `rustc` compilerCategory: PRs that clean code up or issues documenting cleanup.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Relevant to the compiler team, which will review and decide on the PR/issue.
Currently the driver and some other parts of the compiler roll their own
functions to detect if they are connected to a TTY. We should instead use
something like the
attycrate (which we already depend on).