Allow cookies for email-alert-frontend
Allow cookies for email-alert-frontend

This commit changes the Varnish config to allow cookies for email-alert-frontend. This will allow subscription management to work without having to pass around query params.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet