Do not serialize pipeline on each build serialization request

app/assets/javascripts/jobs/store/actions.js

@@ -186,7 +186,7 @@ export const fetchStages = ({ state, dispatch }) => {
   dispatch('requestStages');
 
   axios
-    .get(`${state.job.pipeline.path}.json`)
+    .get(`${state.job.pipeline_path}.json`)
     .then(({ data }) => {
       // Set selected stage
       dispatch('receiveStagesSuccess', data.details.stages);

app/serializers/build_details_entity.rb

@@ -8,7 +8,11 @@ class BuildDetailsEntity < JobEntity
   expose :stuck?, as: :stuck
   expose :user, using: UserEntity
   expose :runner, using: RunnerEntity
-  expose :pipeline, using: PipelineEntity
+
+  # expose :pipeline, using: PipelineEntity
+  expose :pipeline_path do |build|
+    project_pipeline_path(build.project, build.pipeline)
+  end
 
   expose :deployment_status, if: -> (*) { build.starts_environment? } do
     expose :deployment_status, as: :status