Fix cop FactoryBot/InlineAssociation offenses for CA group stages

.rubocop_manual_todo.yml

@@ -44,7 +44,6 @@ Graphql/Descriptions:
 # WIP See https://gitlab.com/gitlab-org/gitlab/-/issues/267606
 FactoryBot/InlineAssociation:
   Exclude:
-    - 'ee/spec/factories/analytics/cycle_analytics/group_stages.rb'
     - 'ee/spec/factories/geo/event_log.rb'
     - 'ee/spec/factories/merge_request_blocks.rb'
     - 'ee/spec/factories/vulnerabilities/feedback.rb'

ee/spec/factories/analytics/cycle_analytics/group_stages.rb

@@ -7,6 +7,6 @@ FactoryBot.define do
     end_event_identifier { Gitlab::Analytics::CycleAnalytics::StageEvents::MergeRequestMerged.identifier }
 
     group
-    value_stream { FactoryBot.build(:cycle_analytics_group_value_stream, group: group) }
+    value_stream { association(:cycle_analytics_group_value_stream, group: group) }
   end
 end