Add "links" collection to index resources, again (#1594)

With the introduction of react-query, it looks like the indexResources attribute of the repository initialization extension properties lost its collection links, which was replaces by _links. In this fix we copy this collection, so that the template plugin still can use links.

Fixes #1593

scm-ui/ui-webapp/src/repos/components/form/RepositoryForm.tsx

@@ -124,10 +124,11 @@ const RepositoryForm: FC<Props> = ({
     if (isEditMode()) {
       return null;
     }
+    const indexResourcesWithLinks = { ...indexResources, links: indexResources?._links };
     const extensionProps = {
       repository: repo,
       setCreationContextEntry: setCreationContextEntry,
-      indexResources
+      indexResources: indexResourcesWithLinks
     };
     return (
       <>