* Initial implementation of non existing property editor
* Adjust `MissingPropertyEditor` to not require registering in PropertyEditorCollection
* Add `MissingPropertyEditor.name` back
* Remove unused dependencies from DataTypeService
* Removed reference to non existing property
* Add parameterless constructor back to MissingPropertyEditor
* Add validation error on document open to property with missing editor
* Update labels
* Removed public editor alias const
* Update src/Umbraco.Web.UI.Client/src/packages/property-editors/missing/manifests.ts
* Add test that checks whether the new MissingPropertyEditor is returned when an editor is not found
* Also check if the editor UI alias is correct in the test
* Apply suggestions from code review
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
* Share property editor instances between properties
* Only store missing property editors in memory in `ContentMapDefinition.MapValueViewModels()`
* Add value converter for the missing property editor to always return a string (same as the Label did previously)
* Small improvements to code block
* Adjust property validation to accept missing property editors
* Return the current value when trying to update a property with a missing editor
Same logic as for when the property is readonly.
* Fix failing unit tests
* Small fix
* Add unit test
* Remove client validation
* UI adjustments
* Adjustments from code review
* Adjust test
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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