Otel bridge transaction not picking correct transaction.result

When using custom Otel instrumentation we're setting span.setStatus as
```
span.setStatus({
code: 2,
});
```
since code 2 is for error in transaction result it should be failure but transaction.result is always coming as success.

Upon further debugging looks like in [here](https://github.com/elastic/apm-agent-nodejs/blob/df03f05388a8c8d2c46e0fc871c2e079886c3fb6/lib/opentelemetry-bridge/OTelSpan.js#L137) `otelSpanStatus` is expecting number.

And as per docs in opentelemetry (and also in their interface), we are expecting to send object with key as `code`
https://opentelemetry.io/docs/languages/js/instrumentation/#recording-exceptions

Attaching screenshots of a Request having 500 status code but in transaction.result it was still success

NOTE: We're using elastic as backend and open-telemetry-bridge enabled

We've added this as a patch for now

```
const statusCodeStartNumber = res.statusCode.toString().charAt(0);
span._span._agent.currentTransaction._result = `HTTP ${statusCodeStartNumber}xx`;
```