Lock web-console to 2.0.0.beta1 for the first 4.2 beta

The console on exception code isn't available on the stable releases
yet. Lock it for now, so the beta users get a sneak peak of the console
features.
Merge pull request #16532 from gsamokovarov/lock-web-console-for-4.2.0.beta1

Lock web-console to 2.0.0.beta1 for the first 4.2 beta