chore(ci): also deploy Firebase functions to `docs-angularjs-org`

Previously, we only deployed to Firebase hosting for the
`docs-angularjs-org` Firebase project. This meant that the deployed
functions used an old version of Node.js and started failing once
support was dropped for that version. See #17111 for details.

This commit fixes this by ensuring that we deploy to all enabled
Firebase services (currently functions and hosting).

Fixes #17111
Fixes angular/angularjs.org#251