Rollup merge of #46103 - zackmdavis:dead_code_lint_should_say_never_constructed_for_variants, r=arielb1

dead code lint to say "never constructed" for variants

As reported in #19140, #44083, and #44565, some users were confused when
the dead-code lint reported an enum variant to be "unused" when it was
matched on (but not constructed). This wording change makes it clearer
that the lint is in fact checking for construction.

We continue to say "used" for all other items (it's tempting to say
"called" for functions and methods, but this turns out not to be
correct: functions can be passed as arguments and the dead-code lint
isn't special-casing that or anything).

Resolves #19140.

r? @pnkfelix

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