Claim CSV presenter refinement

[colinbruce]

Described here by @lostie

[not a blocker] Re-setting this instance variable per iteration of journeys array suggests (to me) that we should probably have some sort of ClaimCSV::Journey presenter that handles all THE journey presentation, leaving this one to be something like:

def parsed_journeys
  journeys.map do |journey|
    ClaimCSV::Journey.new(clean_deallocations(journey)).to_csv
  end
end

This is probably more an improvement in the design of the presenter to isolate the claim presentation from the journey presentation.