build: mark existing Node.js flakes as dontcare (#34658)

Co-authored-by: Shelley Vohr <[email protected]>

script/node-spec-runner.js

@@ -28,6 +28,7 @@ const defaultOptions = [
   '--mode=debug',
   'default',
   `--skip-tests=${DISABLED_TESTS.join(',')}`,
+  '--flaky-tests=dontcare',
   '--shell',
   utils.getAbsoluteElectronExec(),
   '-J'