Remove unnecessary dynamicTag/dynamicLayout capabilities and getDynamicLayout

Per review: dynamicTag does nothing, and dynamicLayout is not needed here.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NullVoxPopuli

packages/@ember/-internals/glimmer/lib/helpers/element.ts

@@ -14,8 +14,6 @@ import { internalHelper } from './internal-helper';
 // content without a wrapper for empty string.
 
 const ELEMENT_CAPABILITIES = {
-  dynamicLayout: true,
-  dynamicTag: true,
   createInstance: true,
   wrapped: true,
 };
@@ -44,10 +42,6 @@ class ElementComponentManager {
     return state.tagName || null;
   }
 
-  getDynamicLayout() {
-    return null;
-  }
-
   getTagName(state: string | null) {
     return state;
   }