Create AccessLimitingOrganisations from Editions

As part of the work to limit edition access to name individuals, the modelling for access limiting by organisation is changing.  Now that the new `AccessLimitingOrganisation` model exists, we need to populate the db table with data from `Editions` who have `access_limiting` set to `organisations`, so that the new limiting logic has data to work with.

This change introduces a data migration that creates a new `AccessLimitingOrganisation` entry for each edition lead and supporting organisation and saves it to the db.

Author: davidsauntson

db/data_migration/20260609152823_populate_access_limiting_orgs_from_editions.rb

@@ -0,0 +1,46 @@
+editions_with_org_access_limits = Edition.unscoped.where(access_limiting: "organisations")
+
+puts "Found #{editions_with_org_access_limits.count} editions with access limiting set to 'organisations'"
+
+warnings = []
+errors = []
+
+editions_with_org_access_limits.each do |edition|
+  # CorporateInformationPages don't have leading or supporting orgs
+  next if edition.instance_of?(CorporateInformationPage)
+
+  msg = "Edition #{edition.id}, lead org ids #{edition.lead_organisations.pluck(:id)}, supporting org ids: #{edition.supporting_organisations.pluck(:id)}"
+
+  orgs = [edition.lead_organisations, edition.supporting_organisations].flatten.compact
+
+  if orgs.empty?
+    warnings << "Edition #{edition.id} has `access_limiting` set to orgs but has no lead or supporting orgs"
+  end
+
+  access_limiting_orgs = []
+
+  orgs.each do |limiting_org|
+    access_limiting_org = AccessLimitingOrganisation.new(edition:, organisation: limiting_org)
+
+    if access_limiting_org.save
+      access_limiting_orgs << access_limiting_org
+    else
+      errors << "Edition #{edition.id} cannot save new `AccessLimitingOrganisation` #{limiting_org.name}`: #{access_limiting_org.errors.full_messages.to_sentence}"
+    end
+
+  end
+
+  edition.access_limiting_organisations = access_limiting_orgs
+
+  if edition.save(validate: false)
+    msg += " - access limiting orgs successfully updated to: #{edition.access_limiting_organisations.pluck(:organisation_id)}"
+  else
+    errors << "Edition #{edition.id} failed to update: #{edition.errors.full_messages.to_sentence}"
+  end
+
+  puts msg
+end
+
+puts "Completed with #{warnings.size} warnings and #{errors.size} errors:"
+warnings.each { |warning| puts "WARNING: #{warning}" }
+errors.each { |error| puts "ERROR: #{error}" }