Remove the visual review toolbar code
in favor of using the NPM package.

As mentioned in
https://github.com/wojtekmaj/react-pdf/blob/master/README.md,
pdf.js needs the bundled cMaps files to work.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/62152

This has the benefit that CE bundles will remove dead code in CE only
builds.

We have a follow-up issue to get rid of this completely:

https://gitlab.com/gitlab-org/gitlab-ce/issues/64173

This removes trailing commas from node scripts which previously
omitted them for compatiblity with node 6

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57169

(cherry picked from commit da3cd00f5a31f762eb67c2824233ad2b275b2ba8)

Conflicts:
	config/webpack.config.js

This suggests possibly related issues when the user types a title.

This uses GraphQL to allow the frontend to request the exact
data that is requires. We also get free caching through the Vue Apollo
plugin.

With this we can include the ability to import .graphql files in JS
and Vue files.
Also we now have the Vue test utils library to make testing
Vue components easier.

Closes #22071