improve test coverage of hasTranslationChanges(), use loadRevisionUnchanged()...

Sascha Grossenbacherrequested to merge
issue/drupal-3562759:3562759-contententitybasehastranslationchanges-must-use into main

improve test coverage of hasTranslationChanges(), use loadRevisionUnchanged() if there is a loaded revision ID

Closes #3562759

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