Add unreleased feature and coronavirus editor permissions
Add unreleased feature and coronavirus editor permissions

Add the requirement for the unreleased feature and coronavirus editor permissions so announcement publishing is not accessible until ready to release.

Co-authored-by: Rosa Fox <7730dfe70100dfd32d4a03b4b554258d5d0f44a0@digital.cabinet-office.gov.uk>

alphagov/collections-publisher,alphagov/collections-publisher,alphagov/collections-publisher