Remove allow_n_plus_1 block from Network::Graph

Closes #37436
Closes gitaly#998

app/models/network/graph.rb

@@ -61,12 +61,9 @@ module Network
         @reserved[i] = []
       end
 
-      # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/37436
-      Gitlab::GitalyClient.allow_n_plus_1_calls do
       commits_sort_by_ref.each do |commit|
         place_chain(commit)
       end
-      end
 
       # find parent spaces for not overlap lines
       @commits.each do |c|