Remove Geo::RegsitryFinder#current_node_fdw method

Since GitLab 13.2 we don't rely on FDW query/models

ee/app/finders/geo/container_repository_registry_finder.rb

@@ -3,7 +3,7 @@
 module Geo
   class ContainerRepositoryRegistryFinder < RegistryFinder
     def count_syncable
-      current_node_non_fdw.container_repositories.count
+      container_repositories.count
     end
 
     def count_synced
@@ -19,7 +19,7 @@ module Geo
     end
 
     def find_registry_differences(range)
-      source_ids = current_node_non_fdw.container_repositories.id_in(range).pluck_primary_key
+      source_ids = container_repositories.id_in(range).pluck_primary_key
       tracked_ids = Geo::ContainerRepositoryRegistry.pluck_model_ids_in_range(range)
 
       untracked_ids = source_ids - tracked_ids
@@ -63,5 +63,11 @@ module Geo
         .limit(batch_size)
     end
     # rubocop:enable CodeReuse/ActiveRecord
+
+    private
+
+    def container_repositories
+      current_node.container_repositories
+    end
   end
 end

ee/app/finders/geo/design_registry_finder.rb

@@ -66,7 +66,7 @@ module Geo
     private
 
     def designs
-      current_node_non_fdw.designs
+      current_node.designs
     end
 
     def registries

ee/app/finders/geo/file_registry_finder.rb

@@ -151,7 +151,7 @@ module Geo
     end
 
     def local_storage_only?
-      !current_node(fdw: false)&.sync_object_storage
+      !current_node&.sync_object_storage
     end
   end
 end

ee/app/finders/geo/lfs_object_registry_finder.rb

@@ -3,13 +3,17 @@
 module Geo
   class LfsObjectRegistryFinder < FileRegistryFinder
     def replicables
-      lfs_objects = current_node(fdw: false).lfs_objects
-
       local_storage_only? ? lfs_objects.with_files_stored_locally : lfs_objects
     end
 
     def syncable
       Geo::LfsObjectRegistry
     end
+
+    private
+
+    def lfs_objects
+      current_node.lfs_objects
+    end
   end
 end

ee/app/finders/geo/registry_finder.rb

@@ -14,18 +14,8 @@ module Geo
 
     private
 
-    def current_node(fdw: true)
-      fdw ? current_node_fdw : current_node_non_fdw
-    end
-
-    def current_node_fdw
-      strong_memoize(:current_node_fdw) do
-        Geo::Fdw::GeoNode.find(current_node_id) if current_node_id
-      end
-    end
-
-    def current_node_non_fdw
-      strong_memoize(:current_node_non_fdw) do
+    def current_node
+      strong_memoize(:current_node) do
         GeoNode.find(current_node_id) if current_node_id
       end
     end

ee/spec/finders/geo/file_registry_finder_spec.rb

@@ -3,8 +3,6 @@
 require 'spec_helper'
 
 RSpec.describe Geo::FileRegistryFinder, :geo do
-  include ::EE::GeoHelpers
-
   context 'with abstract methods' do
     %w[
       replicables