[http exporter] error callback is called twice

[david-luna]

What happened?

Steps to Reproduce

There is an ongoing PR that reproduces the issue in a test. See https://github.com/open-telemetry/opentelemetry-js/pull/5928/files#r2406049422

Expected Result

The error callback should be called only once.

Actual Result

The callback is called twice.

Additional Details

The sendWithHttp method attaches a handler for the error event in the request object here

opentelemetry-js/experimental/packages/otlp-exporter-base/src/transport/http-transport-utils.ts

Line 95 in 8e9b8bb

req.on('error', (error: Error) => {

and afterwards it attaches the same handler in the the stream created for compression and for writing into the request in different places like here

opentelemetry-js/experimental/packages/otlp-exporter-base/src/transport/http-transport-utils.ts

Line 126 in 8e9b8bb

dataStream.pipe(req).on('error', onError);

Tip

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