Add exemptions for some rubocops
Add exemptions for some rubocops

RSpec/DescribeClass - does not really may sense to use in features that
test user journeys rather than specific classes

Rails/HelperInstanceVariable - would require refactor byeond scope of
rails upgrade

ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder