Fix factory hooks when building

This skips some hooks when some associations are not persisted. We still
keep them in `after(:build)` because there are still some cases where we
pass persisted associations to `build`

spec/factories/clusters/kubernetes_namespaces.rb

@@ -10,15 +10,18 @@ FactoryBot.define do
       if cluster.project_type?
         cluster_project = cluster.cluster_project
 
-        kubernetes_namespace.project = cluster_project.project
+        kubernetes_namespace.project = cluster_project&.project
         kubernetes_namespace.cluster_project = cluster_project
       end
 
+      if kubernetes_namespace.project
         kubernetes_namespace.namespace ||=
           Gitlab::Kubernetes::DefaultNamespace.new(
             cluster,
             project: kubernetes_namespace.project
           ).from_environment_slug(kubernetes_namespace.environment&.slug)
+      end
+
       kubernetes_namespace.service_account_name ||= "#{kubernetes_namespace.namespace}-service-account"
     end
 

spec/factories/draft_note.rb

@@ -25,7 +25,7 @@ FactoryBot.define do
     factory :draft_note_on_discussion, traits: [:on_discussion]
 
     trait :on_discussion do
-      discussion_id { create(:discussion_note_on_merge_request, noteable: merge_request, project: project).discussion_id }
+      discussion_id { association(:discussion_note_on_merge_request, noteable: merge_request, project: project).discussion_id }
     end
   end
 end

spec/factories/file_uploaders.rb

@@ -14,7 +14,7 @@ FactoryBot.define do
     end
 
     after(:build) do |uploader, evaluator|
-      uploader.store!(evaluator.file)
+      uploader.store!(evaluator.file) if evaluator.project&.persisted?
     end
 
     initialize_with do