Add a backing field for EditorUIAlias and track changes when its set.

[KevinJump]

Description

Fixes : #19732

The EditorUIAlias property in the DataType model was missing value tracking, so the Dirty methods (IsDirty, GetDirtyProperties, etc) where not registering any changes if this value is updated.

This PR adds the backing field and updates the get and set methods in the DataType model so tracking will pick up any changes.

• Adds a new private string field _editorUIAlias to the DataType model.
• Uses this as the backing field for EditorUIAlias property
• Update Set method to call SetPropertyValueAndDetectChanges when the value is set

[github-actions]

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[Copilot]

Pull Request Overview

This PR enables change tracking for the EditorUiAlias property by introducing a backing field and using the SetPropertyValueAndDetectChanges method in its setter.

• Adds a private nullable string field _editorUIAlias to the DataType model
• Converts EditorUiAlias from an auto-property to a full property with change detection

Comments suppressed due to low confidence (1)

src/Umbraco.Core/Models/DataType.cs:64

• Consider adding unit tests to verify that setting EditorUiAlias correctly marks the DataType instance as dirty and appears in GetDirtyProperties.

    public string? EditorUiAlias

[AndyButland]

Thanks @KevinJump - looks good to me. I just added a unit test that fails before your proposed update is applied, to verify the fix.