Issue #3619363: Use protected instead of private properties

Ben Stallingsrequested to merge
issue/queue_ui-3619363:3619363-use-protected-instead into 4.0.x

DependencySerializationTrait does not support private properties, so change all constructor-promoted properties in classes that use it (forms, the permissions class, and the AlterHooks service) from private to protected.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

Closes #3619363

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