feat: update get insights and purge API schemas and error responses

[siddu1819]

• Updated DELETE /v3/purge endpoint error responses to use new error schema
• Added comprehensive error examples for 400, 401, 404, 422, and 500 status codes
• Updated error response body structure with timestamp, version, txnid, and nested error object
• Included only actual thrown errors

[github-actions]

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