Issue #3609076 by bstallings: Missing return statements

Ben Stallingsrequested to merge
issue/entity-3609076:3609076-missing-return-statements into 8.x-1.x

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

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