Remove allow_n_plus_1 block from Network::Graph

Closes #37436
Closes gitaly#998

app/models/network/graph.rb

@@ -61,11 +61,8 @@ 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
+      commits_sort_by_ref.each do |commit|
+        place_chain(commit)
       end
       # find parent spaces for not overlap lines