Revert "[dart] Disable failing VM service test"

This reverts commit 44b8292eb03cad273df2936a523ad10f6bd0e95e.

Reason for revert: On DNO-460 it is indicated that this test should be safe to re-enable.

Change-Id: Ib92baf8df163f36bbba7de22759d4c3713e3e2a8
diff --git a/packages/tests/BUILD.gn b/packages/tests/BUILD.gn
index 578baf4..f2e4e88 100644
--- a/packages/tests/BUILD.gn
+++ b/packages/tests/BUILD.gn
@@ -112,6 +112,7 @@
     "//topaz/public/dart/fuchsia_modular:fuchsia_modular_package_integration_tests",
     "//topaz/public/dart/fuchsia_services:fuchsia_services_package_integration_tests",
     "//topaz/public/dart/fuchsia_vfs:fuchsia_vfs_package_unittests",
+    "//topaz/runtime/dart/utils:run_vmservice_object_tests",
   ]
 }