Remove live blog show more ab-test code

This test is relatively easy to clean up.

But some of the bigger ones, like alpha adverts, are hard to lift out. @phamann maybe you could take a look at those ones? Here's my hit list.

- alpha adverts (PRs 2085, 2092)
- components
- show more
- live blog show more (done in this PR)
- show more layout
- story package question