Rollup merge of #71899 - cuviper:try_find_map, r=dtolnay

Refactor `try_find` a little

~~This works like `find_map`, but mapping to a `Try` type. It stops when `Ok` is `Some(value)`, with an additional short-circuit on `Try::Error`. This is similar to the unstable `try_find`, but has the advantage of being able to directly return the user's `R: Try` type directly, rather than converting to `Result`.~~
(removed -- `try_find_map` was declined in review)

This PR also refactors `try_find` a little to match style. The `E` type parameter was unnecessary, so it's now removed. The folding closure now has reduced parametricity on just `T = Self::Item`, rather
than the whole `Self` iterator type. There's otherwise no functional change in this.

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