BUGFIX: Add missing event emitters to internal node properties

[Benjamin-K]

Review instructions

Currently, when using the event log, internal node data is not logged. So whenever an internal property like _hiddenBeforeDateTime is changed, you can't see that property in the event log. Therefore, this PR adds missing event emitters to the methods used to set the internal properties.

resolved: #3284

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[Benjamin-K]

By looking into the Code: Shouldn't we also log an event, whenever PublishingService::emitNodeDiscarded($node, $baseWorkspace) is emitted?