Jonathan Brouwer f540b27f90 Rollup merge of #153508 - JonathanBrouwer:improved_eager_format, r=GuillaumeGomez
Clean up the eager formatting API

For https://github.com/rust-lang/rust/issues/151366#event-22181360642

Previously eager formatting worked by throwing the arguments into a diag, formatting, then removing the args again. This is ugly so instead we now just do the formatting completely separately.
This PR has nice commits, so I recommend reviewing commit by commit.

r? @GuillaumeGomez
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