gcp-o11y: add default custom tag for metrics exporter #9982
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This PR adds a default custom tag for metrics, irrespective of custom tags being present in the observability configuration.
OpenCensus by default adds a custom tag opencenus_task for metrics which gets overriden if custom tags are set.
The unique custom tag is required to ensure the uniqueness of the Timeseries. The format of the default custom tag is:
java-{PID}@{HOSTNAME}, if{PID}is not available a random number will be used.