Check for lifetime uses in closures as well (#14608)

The `BodyLifetimeChecker` which checks for the use of any non-anonymous
non-static lifetime did not recurse into closures, missing lifetime
uses. This would lead to a bogus elision suggestion.

The `BodyLifetimeChecker` is not refined enough to avoid false
positives, as any conforming lifetime, including one coming from the
outer context, would be considered a hit. The number of false positives
might increase now that we check closures as well, in case those
closures define and use lifetimes themselves.

changelog: [`needless_lifetimes`]: do not suggest removing a lifetime
which is later used in a closure

Fixes rust-lang/rust-clippy#14607

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