catalog-graph: add default route target

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/proud-readers-move.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-graph': patch
+---
+
+The `catalogEntity` external route will now by default bind to the catalog entity page if it is available.

plugins/catalog-graph/src/routes.ts

@@ -38,4 +38,5 @@ export const catalogEntityRouteRef = createExternalRouteRef({
   id: 'catalog-entity',
   params: ['namespace', 'kind', 'name'],
   optional: true,
+  defaultTarget: 'catalog.catalogEntity',
 });