fix(ngScenario): completely remove the angular scenario runner

The runner has been deprecated and undocumented since 2014:
See commit 8d6d126899d4b1927360599403a7592011243270

Closes #9405

BREAKING CHANGE:

The angular scenario runner end-to-end test framework has been
removed from the project and will no longer be available on npm
or bower starting with 1.7.0.
It was deprecated and removed from the documentation in 2014.
Applications that still use it should migrate to
[Protractor](http://www.protractortest.org).
Technically, it should also be possible to continue using an
older version of the scenario runner, as the underlying APIs have
not changed. However, we do not guarantee future compatibility.