Elements: Fix GetUdi() extension methods for Element entities

[ronaldbarendse]

Prerequisites

• I have added steps to test this contribution in the description below

Description

Adds the missing GetUdi() overloads for IElement, so v18 Global Elements (Library section) can produce their umb://element/{key} identifier through the same extension surface used for documents, media and members.

The gap

UdiGetterExtensions.GetUdi(this IContentBase) switches on IContent/IMedia/IMember and throws NotSupportedException for anything else - including IElement, which inherits from IPublishableContentBase : IContentBase. The same path is reached via GetUdi(this IEntity), which dispatches IContentBase instances down to the same switch.

This is part of a recurring pattern with this extension class missing new entity types - prior fixes:

• v17: Members: Fix EntityContainer.GetUdi() for member type containers #20840 - EntityContainer.GetUdi() for member type containers
• v15: Add UDI support for relation, user and user-group entity types #17490 - relation, user and user-group entity types
• v14: Fix IContentBase.GetUdi() extension method to support document-blueprint entity type #16939 - IContentBase.GetUdi() for document blueprints
• v13: Fix IWebhook.GetUdi() and IEntity.GetUdi() extension methods #15288 - IWebhook.GetUdi() and IEntity.GetUdi()

Changes

• UdiGetterExtensions.GetUdi(this IContentBase) - new IElement case (cases reordered alphabetically).
• New UdiGetterExtensions.GetUdi(this IElement) returning new GuidUdi(Constants.UdiEntityType.Element, entity.Key) (i.e. umb://element/{key}).
• UdiGetterExtensionsTests - new GetUdiForElement test covering direct, IContentBase, and IEntity dispatch; GetUdiForEntityContainer extended with an Element test case (already worked via EntityContainer.GetUdi(), now locked in).

Testing

• dotnet test --filter UdiGetterExtensionsTests - 34/34 pass.
• Manual: ((IContentBase)element).GetUdi() no longer throws NotSupportedException.
• Manual: all three dispatch paths (IElement, IContentBase, IEntity) return the same umb://element/{key} UDI.

[claude]

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[Copilot]

Pull request overview

Adds missing UDI support for IElement entities so elements (Global Elements / Library) can produce umb://element/{key} consistently via the existing GetUdi() extension surface (directly and through IContentBase / IEntity dispatch).

Changes:

• Extend UdiGetterExtensions.GetUdi(this IContentBase) to support IElement.
• Add GetUdi(this IElement) overload returning a GuidUdi with Constants.UdiEntityType.Element.
• Add/extend unit tests to cover element UDIs and ensure all dispatch paths return the same value.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Umbraco.Core/Extensions/UdiGetterExtensions.cs	Adds IElement UDI generation and routes IContentBase.GetUdi() to it.
tests/Umbraco.Tests.UnitTests/Umbraco.Core/Extensions/UdiGetterExtensionsTests.cs	Adds element UDI test coverage (direct + interface dispatch) and extends container test cases.

[AndyButland]

Thanks @ronaldbarendse - all looks good to handle these cases.