chore(jenkins): do not publish to code.angularjs.org snapshot

While the firewall continues to block the update ports
we will not try to publish there. This will be fixed when we move to hosting
the sites on Firebase.

This means that successful builds on master will not automatically update
code.angularjs.org, this will affect:

* https://code.angularjs.org/snapshot, which people often use to check latest features
* https://docs.angularjs.org, which is supposed to display the docs for the latest master

As it turns out we can manually partially trigger an update by browsing to
https://code.angularjs.org/gitFetchSite.php but we just can’t guarantee that we will update
both the round robin servers.