(feat): Make feature cookie work for front-end

Firstly this entails changes to the feature service's has() There's issues present when all tests are ran whole, where-in the cookie handling between tests is done incorrectly.

added StatusInProgress + 1 deleted label

assigned to @benhayward.ben

added to epic &76 (closed)

changed milestone to %Misc. Q4 2019

changed weight to 2

changed weight to 2

changed time estimate to 3h

changed the description

added StatusReview label and removed StatusInProgress label

added 2h of time spent at 2019-09-25

added 1 deleted label

closed

removed StatusReview label