[exporter/signalfx] Use "unknown" env correlation value as fallback #31052
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Description:
Use the same fallback value for the metrics/tracing environment correlation calls as being set by the backend on the traces. This fixed the APM/IM correlation in the Splunk Observability UI for the users that send traces with no "deployment.environment" resource attribute value set.
Testing: Updated unit test and validated the fix manually.