Incorrect processing of tool call result for observability

[Yev4all]

Use case: create observability/span information with functional call details

In case of OBSERVABILITY_SETTINGS.SENSITIVE_DATA_ENABLED setting framework tries to set value of gen_ai.tool.call.result span attribute. Framework makes assumption that all results are json formattable which is not correct in case of TextContent result type.
That processing creates exception which provides incorrect value.

gen_ai.tool.call.result": "non-serializable result"

In a current implementation errors occur in _tools.py

Please let me know if any additional information is required to repro such a behavior

Thank you

YK