Fixed flaky EE specific Ci::Pipeline test

This test would expect pipelines to be returned in a particular order,
without actually ordering the rows. This could lead to the test
sometimes failing. To solve this, we use `to include` instead of `to
eq`.

ee/spec/models/ci/pipeline_spec.rb

@@ -36,7 +36,7 @@ describe Ci::Pipeline do
     end
 
     it "returns pipeline with security reports" do
-      expect(described_class.with_legacy_security_reports).to eq([pipeline_1, pipeline_2, pipeline_3, pipeline_4])
+      expect(described_class.with_legacy_security_reports).to contain_exactly(pipeline_1, pipeline_2, pipeline_3, pipeline_4)
     end
   end