message: fix(tracing): Remove `connection.downlink` measurement
  As per RFC: we have decided to remove `connection.downlink` from as a recorded performance metrics in the `BrowserTracing` integration.
diff: @@ -395,10 +395,6 @@ function _trackNavigator(transaction: Transaction): void {
  if (isMeasurementValue(connection.rtt)) {
  _measurements['connection.rtt'] = { value: connection.rtt, unit: 'millisecond' };
  }
  -
  - if (isMeasurementValue(connection.downlink)) {
  - _measurements['connection.downlink'] = { value: connection.downlink, unit: '' }; // unit is empty string for now, while relay doesn't support download speed units
  - }
  }
  if (isMeasurementValue(navigator.deviceMemory)) {
  