clearTarget() clears the wrong translation if entity and processor language differ

hans rosselrequested to merge
issue/feeds-3628836:cleartarget-processor-language into 8.x-3.x

clearTarget() now only switches to a translation when the target is translatable (a language on the mapping and a translatable field), so it clears the translation that setTarget() writes to. The two added kernel tests in TranslationTest fail without this change.

Closes #3628836

AI disclosure: This contribution was human-driven, AI-assisted, human-reviewed and tested in a real project.

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