packages/prometheus: Upgrade to package format_version v3 #11988
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Proposed commit message
Upgrade to package format_version v3. Tested using elastic-package (pipeline, static, etc.) and also linting and building. Also did basic testing by scraping data from Prometheus Server itself and populating the dashboard. Works as expected. For testing, I used 8.16.1 cluster.
Checklist
changelog.ymlfile.Related issues
#8028
Screenshots
Dashboards screenshots after using collector to scrape metrics from Prometheus Server itself.