Geo: Remove released feature flag `geo_package_file_verification`

Removes the feature flag, it was enabled by default for a long time

changelogs/unreleased/323309-geo-remove-released-feature-flag-geo_package_file_verification.yml

+---
+title: 'Geo: Remove released feature flag `geo_package_file_verification`'
+merge_request: 61568
+author:
+type: other

ee/app/replicators/geo/package_file_replicator.rb

@@ -11,7 +11,7 @@ module Geo
 
     override :verification_feature_flag_enabled?
     def self.verification_feature_flag_enabled?
-      Feature.enabled?(:geo_package_file_verification, default_enabled: :yaml)
+      true
     end
 
     def carrierwave_uploader

ee/config/feature_flags/development/geo_package_file_verification.yml

----
-name: geo_package_file_verification
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46998
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/271680
-milestone: '13.6'
-type: development
-group: group::geo
-default_enabled: true

ee/spec/lib/gitlab/geo_spec.rb

@@ -384,16 +384,6 @@ RSpec.describe Gitlab::Geo, :geo, :request_store do
         expect(described_class.verification_enabled_replicator_classes).not_to include(Geo::PackageFileReplicator)
       end
     end
-
-    context 'when verification is disabled' do
-      before do
-        stub_feature_flags(geo_package_file_verification: false)
-      end
-
-      it 'does not return the replicator class' do
-        expect(described_class.verification_enabled_replicator_classes).not_to include(Geo::PackageFileReplicator)
-      end
-    end
   end
 
   describe '.verification_max_capacity_per_replicator_class' do