Add rego policy that checks all attributes have role on stable entities

[lmolkova]

see #3339 for the context

[thompson-tomo]

@lmolkova there already is a policy https://github.com/open-telemetry/semantic-conventions/blob/main/policies/entity_stability.rego and it is explainable why it didn't trigger on the linked issue. See #3339 (comment) in linked issue.