Force the result object from OTEL as STRING

This commit changes the `else` condition from `instrument_tracing` so
any object which is not properly mapped gets converted into `String`
before sending the dictionary to the span.

With this we expect to no longer have an OTEL unsupported type being
passed as a span value.

Refers to CLOUDDST-23028

iib/common/tracing.py

@@ -136,7 +136,7 @@ def wrapper(*args, **kwargs):
                         span_result = {'response': response, 'http_code': code}
                     else:
                         # If the returned result is not of type dict, create one
-                        span_result = {'result': result or 'success'}
+                        span_result = {'result': str(result) or 'success'}
                 except Exception as exc:
                     span.set_status(Status(StatusCode.ERROR))
                     span.record_exception(exc)