Fix applying GitHub-imported labels when importing job is interrupted

Closes #24075

CHANGELOG.md

@@ -66,6 +66,7 @@ entry.
 - In all filterable drop downs, put input field in focus only after load is complete (Ido @leibo)
 - Improve search query parameter naming in /admin/users !7115 (YarNayar)
 - Fix table pagination to be responsive
+- Fix applying GitHub-imported labels when importing job is interrupted
 - Allow to search for user by secondary email address in the admin interface(/admin/users) !7115 (YarNayar)
 - Updated commit SHA styling on the branches page.
 

lib/gitlab/github_import/importer.rb

@@ -59,6 +59,8 @@ module Gitlab
             end
           end
         end
+
+        ensure_labels_are_cached
       end
 
       def import_milestones
@@ -234,6 +236,14 @@ module Gitlab
         end
       end
 
+      def ensure_labels_are_cached
+        return unless @labels.empty?
+
+        project.labels.select(:id, :title).find_each do |label|
+          @labels[label.title] = label.id
+        end
+      end
+
       def fetch_resources(resource_type, *opts)
         return if imported?(resource_type)