What is the problem you're trying to solve

Containerd has opentelemetry trace support, but currently there are no unit tests or integration tests related to otel plugin nor tests around individual spans.

This can include:

1. Testing the otel SDK
2. Testing manual instrumentation

There is helper package available already https://pkg.go.dev/go.opentelemetry.io/otel/sdk/trace/tracetest

Having proper testing will help verify otel trace behavior and detect any regression

Describe the solution you'd like

We need to first add some test coverage for the Otel SDK related methods and then extend testing across instrumented spans.

• Unit tests around newExporter and newTracer
• For spans, we can use tracetest to create in memory exporter and verify span and attributes in places where we instrument spans

Additional context

No response