Aggregate failures for PolicyCommitService specs
What does this MR do and why?
This MR adds :aggregate_failures
to specs in ee/spec/services/security/security_orchestration_policies/policy_commit_service_spec.rb
to learn about failures to allow us to resolve them efficiently. Some of these tests started behaving flaky (see [Test] ee/spec/services/security/security_orche... (#444720 - closed) and [Test] ee/spec/services/security/security_orche... (#444734 - closed))
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