Fix build spec duplication

.rubocop.yml

@@ -408,7 +408,6 @@ RSpec/RepeatedExample:
     - 'spec/lib/gitlab/git/blob_spec.rb'
     - 'spec/lib/gitlab/import_export/project/relation_factory_spec.rb'
     - 'spec/models/ability_spec.rb'
-    - 'spec/models/ci/build_spec.rb'
     - 'spec/models/concerns/issuable_spec.rb'
     - 'spec/models/project_services/chat_message/pipeline_message_spec.rb'
     - 'spec/routing/admin_routing_spec.rb'

changelogs/unreleased/refactor-build-spec.yml

+---
+title: Fix build duplicate spec
+merge_request: 28633
+author: Rajendra Kadam
+type: added

spec/models/ci/build_spec.rb

@@ -3337,7 +3337,7 @@ describe Ci::Build do
         end
 
         it "doesn't save timeout" do
-          expect { run_job_without_exception }.not_to change { job.reload.ensure_metadata.timeout_source }
+          expect { run_job_without_exception }.not_to change { job.reload.ensure_metadata.timeout }
         end
 
         it "doesn't save timeout_source" do