Remove feature flag from project repository scheduler worker

Since GitLab 13.2 we don't rely on FDW queries
to sync these repositories.

ee/app/workers/geo/repository_shard_sync_worker.rb

@@ -76,66 +76,32 @@ module Geo
 
     # rubocop: disable CodeReuse/ActiveRecord
     def find_project_ids_not_synced(except_ids:, batch_size:)
-      if Geo::ProjectRegistry.registry_consistency_worker_enabled?
-        project_ids =
-          find_never_synced_project_ids(batch_size: batch_size, except_ids: except_ids)
+      project_ids =
+        registry_finder
+          .find_never_synced_registries(batch_size: batch_size, except_ids: except_ids)
+          .pluck_model_foreign_key
 
-        find_project_ids_within_shard(project_ids, direction: :desc)
-      else
-        find_unsynced_projects(batch_size: batch_size)
-          .id_not_in(except_ids)
-          .reorder(last_repository_updated_at: :desc)
-          .pluck_primary_key
-      end
+      find_project_ids_within_shard(project_ids, direction: :desc)
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
-    def find_unsynced_projects(batch_size:)
-      Geo::ProjectUnsyncedFinder
-        .new(current_node: current_node, shard_name: shard_name, batch_size: batch_size)
-        .execute
-    end
-
     # rubocop: disable CodeReuse/ActiveRecord
     def find_project_ids_updated_recently(except_ids:, batch_size:)
-      if Geo::ProjectRegistry.registry_consistency_worker_enabled?
-        project_ids =
-          find_retryable_dirty_project_ids(batch_size: batch_size, except_ids: except_ids)
+      project_ids =
+        registry_finder
+          .find_retryable_dirty_registries(batch_size: batch_size, except_ids: except_ids)
+          .pluck_model_foreign_key
 
-        find_project_ids_within_shard(project_ids, direction: :asc)
-      else
-        find_projects_updated_recently(batch_size: batch_size)
-          .id_not_in(except_ids)
-          .order('project_registry.last_repository_synced_at ASC NULLS FIRST, projects.last_repository_updated_at ASC')
-          .pluck_primary_key
-      end
+      find_project_ids_within_shard(project_ids, direction: :asc)
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
-    def find_projects_updated_recently(batch_size:)
-      Geo::ProjectUpdatedRecentlyFinder
-        .new(current_node: current_node, shard_name: shard_name, batch_size: batch_size)
-        .execute
-    end
-
     def valid_shard?
       return true unless current_node.selective_sync_by_shards?
 
       current_node.selective_sync_shards.include?(shard_name)
     end
 
-    def find_never_synced_project_ids(batch_size:, except_ids:)
-      registry_finder
-        .find_never_synced_registries(batch_size: batch_size, except_ids: except_ids)
-        .pluck_model_foreign_key
-    end
-
-    def find_retryable_dirty_project_ids(batch_size:, except_ids:)
-      registry_finder
-        .find_retryable_dirty_registries(batch_size: batch_size, except_ids: except_ids)
-        .pluck_model_foreign_key
-    end
-
     # rubocop:disable CodeReuse/ActiveRecord
     def find_project_ids_within_shard(project_ids, direction:)
       Project