telemetry: fix handling of off-GCP generic node cases #4003
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In certain off-GCP testing scenarios, the Stackdriver extension can be used with no platform metadata (no
GCP_METADATA
). This can lead to proxy crashes when trying to lookup platform metadata when building a Monitored Resource for reporting.This PR adds a check to ensure platform metadata exists when building
generic_node
MRs. A test is added to ensure no crashing.Fixes istio/istio#40201