Address reviewer comments

app/controllers/import/github_controller.rb

@@ -58,7 +58,7 @@ class Import::GithubController < Import::BaseController
   # rubocop: disable CodeReuse/ActiveRecord
   override :importable_repos
   def importable_repos
-    already_added_projects_names = already_added_projects.map(&:import_source)
+    already_added_projects_names = already_added_projects.pluck(:import_source)
 
     client_repos.reject { |repo| already_added_projects_names.include?(repo.full_name) }
   end