Add new_gc_metrics to all jmx integrations #7073
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JMXfetch reads a flag named
new_gc_metrics
ininit_config
that makes it produce different GC metrics. But it's not documented it in integrations.New metrics are documented in

java/metadata.csv
Agent changelog notice: https://github.com/DataDog/datadog-agent/blob/afb595fa7567e5c006ab84ee03a33aaf49d8567b/CHANGELOG.rst#upgrade-notes-10
Usage example: https://github.com/DataDog/datadog-agent/blob/41be52cc63a629f7a18e94fc6e36733e0ff967dd/cmd/agent/dist/conf.d/jmx.d/conf.yaml.example#L11