Use find_by_id and remove rubocop skip flags

ee/lib/gitlab/geo/replication/file_downloader.rb

@@ -24,13 +24,9 @@ module Gitlab
 
         private
 
-        # rubocop: disable CodeReuse/ActiveRecord
-
         def find_resource
-          Upload.find_by(id: object_db_id)
+          Upload.find_by_id(object_db_id)
         end
-
-        # rubocop: enable CodeReuse/ActiveRecord
       end
     end
   end

ee/lib/gitlab/geo/replication/job_artifact_downloader.rb

@@ -19,13 +19,9 @@ module Gitlab
 
         private
 
-        # rubocop: disable CodeReuse/ActiveRecord
-
         def find_resource
-          ::Ci::JobArtifact.find_by(id: object_db_id)
+          ::Ci::JobArtifact.find_by_id(object_db_id)
         end
-
-        # rubocop: enable CodeReuse/ActiveRecord
       end
     end
   end

ee/lib/gitlab/geo/replication/lfs_downloader.rb

@@ -19,13 +19,9 @@ module Gitlab
 
         private
 
-        # rubocop: disable CodeReuse/ActiveRecord
-
         def find_resource
-          LfsObject.find_by(id: object_db_id)
+          LfsObject.find_by_id(object_db_id)
         end
-
-        # rubocop: enable CodeReuse/ActiveRecord
       end
     end
   end