Merge branch 'jc-add-ff-for-all-lfs-pointers-go' into 'master'

Adding gitaly feature flag for go implementation of get all lfs pointers

See merge request gitlab-org/gitlab-ce!31696

lib/feature/gitaly.rb

@@ -10,6 +10,7 @@ class Feature
         get_commit_signatures
         cache_invalidator
         inforef_uploadpack_cache
+        get_all_lfs_pointers_go
       ].freeze
 
     DEFAULT_ON_FLAGS = Set.new([]).freeze