KX-18559 Ensure usages extraction for the Text widget

Author: petrinecp

src/Kentico.Xperience.Mjml.StarterKit.Rcl/Widgets/TextWidget/TextWidgetProperties.cs

@@ -1,4 +1,8 @@
-namespace Kentico.Xperience.Mjml.StarterKit.Rcl.Widgets;
+using CMS.ContentEngine;
+
+using Kentico.EmailBuilder.Web.Mvc;
+
+namespace Kentico.Xperience.Mjml.StarterKit.Rcl.Widgets;
 
 /// <summary>
 /// Configurable properties of the <see cref="TextWidget"/>.
@@ -8,5 +12,6 @@ public sealed class TextWidgetProperties : WidgetPropertiesBase
     /// <summary>
     /// The widget content.
     /// </summary>
+    [TrackContentItemReference(typeof(ContentItemReferenceExtractor))]
     public string Text { get; set; } = string.Empty;
 }