Define and use a `print_maybe_styled!` macro in libsyntax/diagnostic.rs

`EmitterWriter::print_maybe_styled` was basically always used with `format!`, so
this macro makes some code cleaner. It should also remove some unnecessary
allocations (most `print_maybe_styled` invocations allocated a `String`
previously, whereas the new macro uses `write_fmt` to write the formatted string
directly to the terminal).

This probably could have been part of #26838, but it’s too late now.

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