[exporters/signalfx] add statusCode to logging field on dimension client (#2459)
[exporters/signalfx] add statusCode to logging field on dimension client (#2459)

Description: Adds status code to logging field in the dimension client.
It would be nice to see the status code of why we could not
update a dimiension.
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector-contrib