Migrations: Handles rich text blocks created with TinyMCE in convert local links migration and refreshes internal datatype cache following migration requiring cache rebuild (closes #20885) (#20887)

Handles rich text blocks created with TinyMCE in convert local links migration.
Refreshes internal datatype cache following migration requiring cache rebuild.

src/Umbraco.Core/Models/Blocks/RichTextBlockValue.cs

@@ -23,4 +23,11 @@ public class RichTextBlockValue : BlockValue<RichTextBlockLayoutItem>
     /// <inheritdoc />
     [JsonIgnore]
     public override string PropertyEditorAlias => Constants.PropertyEditors.Aliases.RichText;
+
+    /// <inheritdoc />
+#pragma warning disable CS0672 // Member overrides obsolete member
+#pragma warning disable CS0618 // Type or member is obsolete
+    public override bool SupportsBlockLayoutAlias(string alias) => base.SupportsBlockLayoutAlias(alias) || alias.Equals("Umbraco.TinyMCE");
+#pragma warning restore CS0618 // Type or member is obsolete
+#pragma warning restore CS0672 // Member overrides obsolete member
 }

src/Umbraco.Core/Models/PublishedContent/IPublishedContentTypeFactory.cs

@@ -53,6 +53,12 @@ public interface IPublishedContentTypeFactory
     /// </summary>
     PublishedDataType GetDataType(int id);
 
+    /// <summary>
+    ///     Clears the internal data type cache.
+    /// </summary>
+    void ClearDataTypeCache()
+    { }
+
     /// <summary>
     ///     Notifies the factory of datatype changes.
     /// </summary>

src/Umbraco.Core/Models/PublishedContent/PublishedContentTypeFactory.cs

@@ -65,6 +65,22 @@ public class PublishedContentTypeFactory : IPublishedContentTypeFactory
         return dataType;
     }
 
+    /// <inheritdoc />
+    public void ClearDataTypeCache()
+    {
+        if (_publishedDataTypes is null)
+        {
+            // Not initialized yet, so skip and avoid lock
+            return;
+        }
+
+        lock (_publishedDataTypesLocker)
+        {
+            // Clear cache (and let it lazy initialize again later)
+            _publishedDataTypes = null;
+        }
+    }
+
     /// <inheritdoc />
     public void NotifyDataTypeChanges(params int[] ids)
     {