Issue #3609076 by bstallings: Missing return statements
Add explicit return statements to RevisionOverviewController::buildRevertRevisionLink(), buildDeleteRevisionLink(), RevisionableContentEntityForm::save(), and EnhancedEntityForm::save() so they align with their parent class/interface contracts.
Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Closes #3609076