Evict remote objects from every cache layer

DELETE /objects only removed the artifacts row, so mutable indexes (S3
index object + Redis TTL/ETag keys) kept being served. Clear all layers
and treat a trailing * as a prefix.

internal/api/v2/local_objects_test.go

@@ -40,7 +40,7 @@ func TestLocalObjectsListing(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	h := NewObjectsHandler(db)
+	h := NewObjectsHandler(db, nil)
 	router := chi.NewRouter()
 	router.Route("/locals/{name}/objects", func(r chi.Router) {
 		r.Get("/", h.LocalRoutes().ServeHTTP)