* OpenAPI: Define default response structure for ListOperations
Almost all Vault ListOperation responses have an identical response
schema. Update the OpenAPI generator to know this, and remove a few
instances where that standard response schema had been manually
copy/pasted into place in individual endpoints.
* changelog
* Only render StandardListResponse schema, if an operation uses it
* Teach the response schema validation test helper about the default list schema too
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Co-authored-by: Anton Averchenkov <84287187+averche@users.noreply.github.com>
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