Whitelist Gitaly N+1 for forking in tests

This helper is right on the limit of the number of calls being made.
When the request store is enabled, and Sidekiq is running in inline
mode, just a couple of additional actions result in it being pushed
over the line.

The operation is entirely artificial, since in reality we'd perform
these requests in multiple separate processes, so just whitelist it
for now.

spec/support/helpers/project_forks_helper.rb

 module ProjectForksHelper
   def fork_project(project, user = nil, params = {})
+    Gitlab::GitalyClient.allow_n_plus_1_calls do
+      fork_project_direct(project, user, params)
+    end
+  end
+
+  def fork_project_direct(project, user = nil, params = {})
     # Load the `fork_network` for the project to fork as there might be one that
     # wasn't loaded yet.
     project.reload unless project.fork_network
@@ -44,11 +50,16 @@ module ProjectForksHelper
   end
 
   def fork_project_with_submodules(project, user = nil, params = {})
-    forked_project = fork_project(project, user, params)
-    TestEnv.copy_repo(forked_project,
+    Gitlab::GitalyClient.allow_n_plus_1_calls do
+      forked_project = fork_project_direct(project, user, params)
+      TestEnv.copy_repo(
+        forked_project,
         bare_repo: TestEnv.forked_repo_path_bare,
-                      refs: TestEnv::FORKED_BRANCH_SHA)
+        refs: TestEnv::FORKED_BRANCH_SHA
+      )
       forked_project.repository.after_import
+
       forked_project
     end
+  end
 end