Added new javascript build targets

I added a few new build targets to the javascript build
(without replacing the old one). The goal is for these builds
to be more atomic, and to separate out the
draft build entirely. The eventual goal is that we can
declare javascript builds similar to the following.

- name: openstack-infra/storyboard-webclient
    check:
      - gate-storyboard-webclient-js-test-unit
      - gate-storyboard-webclient-js-test-integration
      - gate-storyboard-webclient-js-test-functional
      - gate-storyboard-webclient-js-draft
    gate:
      - gate-storyboard-webclient-js-test-unit
      - gate-storyboard-webclient-js-test-integration
      - gate-storyboard-webclient-js-test-functional
    post:
      - storyboard-webclient-js-release-branch
    release:
      - storyboard-webclient-js-release-master

Change-Id: I6d764c7ebfddc13c7be193375b0ab413170014dc
Merge "Added new javascript build targets"