Add missing @return types for StringTranslationTrait::formatPlural() and ::getNumberOfPlurals()

Seems pretty straight forward.

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

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Rerolled again.

And again :))

YAR! (yet another reroll)

We ran into this at ✨ Provide a Config Action to add/edit a component in a layout Active . This would be a much better way to resolve it than to add to the baseline there :D Such great diffstat also :)

Committed/pushed to 11.x and cherry-picked to 11.1.x, thanks!

catch → closed merge request !9995

Automatically closed - issue fixed for 2 weeks with no activity.