[dx] warn early about deprecated skipped rules, as not neccessary to skip anymore

[TomasVotruba]

Ref: rectorphp/rector#9543

---

Rector already warns about rules that are used, but deprecated. That way they can be removed/adjusted in time.

For the skip option we don't have such reporting yet, so it can lead to sudden removal.

return RectorConfig::configure()
->withSkip([
        \Rector\Php81\Rector\Array_\FirstClassCallableRector::class,
]);

This PR fixes that :)

[github-actions]

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