Context
Instead of fixing this and potentially opening a can of worms with our log component we are going to degrade functionality here for the time being until we schedule the "Log Improvements" epic

Scope

• Clicking "Show complete log" opens the log for the step in a new window
  • Functionally the same as the "open log for stage/parallel" feature pictured below
  • 

Original request
https://media.giphy.com/media/l0Iy8VknYtOxjmQQU/giphy.gif
What is should do: show all the log for the step inline? (not sure it has even been specced). 
I expect this has been broken for some time (since the log logic changed, to my protests). 
A ATH test should cover this (there was meant to already be one).