Remove selective sync concern from Geo::Fdw::GeoNode

ee/app/models/concerns/geo/selective_sync.rb

@@ -123,12 +123,7 @@ module Geo::SelectiveSync
     namespaces.arel_table
   end
 
-  def project_model
-    raise NotImplementedError,
-      "#{self.class} does not implement #{__method__}"
-  end
-
   def projects_table
-    project_model.arel_table
+    Project.arel_table
   end
 end

ee/app/models/geo/fdw/geo_node.rb

@@ -3,8 +3,6 @@
 module Geo
   module Fdw
     class GeoNode < ::Geo::BaseFdw
-      include ::Geo::SelectiveSync
-
       self.primary_key = :id
       self.inheritance_column = nil
       self.table_name = Gitlab::Geo::Fdw.foreign_table_name('geo_nodes')

ee/app/models/geo_node.rb

@@ -409,8 +409,4 @@ class GeoNode < ApplicationRecord
   def projects_for_selected_shards
     Project.within_shards(selective_sync_shards)
   end
-
-  def project_model
-    Project
-  end
 end