Fabric native: use SDK not ARM for update offers/collections. Enable Delete Container context menu item in resource tree (#2069)

* For all control plane operations, do not use ARM for Fabric. Enable "delete container" for fabric native.

* Fix unit test

* Fix tre note tests with proper fabric config. Add new fabric non-readonly test.

src/Explorer/ContextMenuButtonFactory.tsx

@@ -146,7 +146,7 @@ export const createCollectionContextMenuButton = (
     });
   }
 
-  if (configContext.platform !== Platform.Fabric) {
+  if (!isFabric() || (isFabric() && !userContext.fabricContext?.isReadOnly)) {
     items.push({
       iconSrc: DeleteCollectionIcon,
       onClick: (lastFocusedElement?: React.RefObject<HTMLElement>) => {