LogRecord Produces Invalid JSON Serialization of Resource

[sernst]

Describe your environment

Not Python version or environment specific.

Steps to reproduce

Use a console log exporter or create a lightweight log exporter that calls the LogRecord.to_json method to observe that the Resource object is a Python repr serialized object and not a JSON-compatible serialized object.

What is the expected behavior?

I expect the Resource object serialization to be valid JSON and match the serialization of the other two signal types from ReadableSpan.to_json and MetricsData.to_json.

What is the actual behavior?

The output displays a Python repr version of the Resource attributes and is not a compatible structure with the other signal type exports of the same data format.

Additional context

N/A

[emdneto]

@open-telemetry/python-approvers I think this is fixed in #3972. We can close this one, too