[ML] Anomaly Explorer- Add secondary sort to list of influencers

[pheyos]

In the Anomaly Explorer: When there is a tie in max score for two influencers the sorting is not always intuitive:

I would expect these two entries to be changed.

Suggestion: Introduce a secondary sort by total score (which of course also effects the swim lane ordering)

Discussion: A few items from the discussion with @peteharverson:

• The UI only shows floored scores, so there may not actually be a tie (e.g. 91.3 and 91.1)
• We agreed to do the secondary sort if the floored values are the same, even if one actual score is higher

[elasticmachine]

Pinging @elastic/ml-ui