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test: fix cross-browser client-cert/websocket assertions and lint

- client-cert handshake-abort error wording varies by browser AND platform
  (chromium ERR_BAD_SSL_CLIENT_AUTH_CERT, firefox SSL_ERROR_UNKNOWN, webkit
  'Certificate is required' on linux/macos / 'Failure when receiving data' on
  windows); match any known variant
- Firefox websocket error is now ': 404' like other browsers (was
  CLOSE_ABNORMAL) since v1.61
- replace deprecated WaitForTimeout with time.Sleep; check Close/Stop returns