Bug 1059317 - Move talos stats to a separate panel

This patch creates a new panel dedicated to the talos results.
The way the talos panel is enabled and disabled is a bit hacky, but for now we don't have any other exception like this. We may want to think about a more elegant solution if we face another case like this in the future
Yeah, by job_type == 'talos'
ie from:
https://github.com/mozilla/treeherder-service/blob/5f0c9f7e055f4d5f895d713b303cf4ed419ee1d0/treeherder/etl/buildbot.py#L327
...seems cleaner than using the symbol which could change :-)