Revert changes until gitlab-org/gitlab-ce!12435 is merged

app/services/groups/destroy_service.rb

 module Groups
   class DestroyService < Groups::BaseService
     def async_execute
-      # Don't call `group.destroy` since this will purge all the projects, which may be too slow
-      group.deleted_at = Time.now
+      # Soft delete via paranoia gem
+      group.destroy
       job_id = GroupDestroyWorker.perform_async(group.id, current_user.id)
       Rails.logger.info("User #{current_user.id} scheduled a deletion of group ID #{group.id} with job ID #{job_id}")
     end

spec/services/ee/groups/destroy_service_spec.rb

-require 'spec_helper'
-
-describe Groups::DestroyService, services: true do
-  let!(:user)         { create(:user) }
-  let!(:group)        { create(:group) }
-  let!(:project)      { create(:empty_project, namespace: group) }
-  let!(:geo_node) { create(:geo_node, :current, :primary) }
-
-  before do
-    group.add_user(user, Gitlab::Access::OWNER)
-  end
-
-  it 'creates a Geo event log when project is deleted synchronously' do
-    Groups::DestroyService.new(group, user).execute
-
-    expect(Geo::EventLog.count).to eq(1)
-    expect(Geo::RepositoryDeletedEvent.count).to eq(1)
-  end
-
-  it 'creates a Geo event log when project is deleted asynchronously' do
-    Sidekiq::Testing.inline! { Groups::DestroyService.new(group, user).async_execute }
-
-    expect(Geo::EventLog.count).to eq(1)
-    expect(Geo::RepositoryDeletedEvent.count).to eq(1)
-  end
-end