Issue #3397027 add WorkflowButtonsWidget::validateElement to correctly set moderation_state

Ian Carlsonrequested to merge
issue/workflow_buttons-3397027:3397027-have-to-publish into 8.x-1.x

Closes #3397027

The OptionsWidgetBase::validateElement method fails to correctly set the $form_state for moderation_state. This causes issues in ModerationStateFieldItemList->updateModeratedEntity, preventing the detection of moderation state changes. Consequently, this leads to downstream issues with pathauto.

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