Add proper tracing spans to rustc_trait_selection::traits::error_reporting #97805
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While I was trying to figure out #97704 I did some of this to make the logs more legible, so I figured I'd do the whole module and open a PR with it. afaict this is an ongoing process in the compiler from the log->tracing transition? but lmk if there was a reason for the more verbose forms of logging as they are.
Also, for some of the functions with only one log in them, I put the function name as a message for that log instead of
#[instrument]
-ing the whole function with a span? but maybe the latter would actually be preferable, I'm not actually sure.