Release azure_metrics package for v8.0.0

[endorama]

What does this PR do?

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

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• Start Time: 2021-11-17T16:18:52.341+0000

• Duration: 12 min 37 sec

• Commit: b8d195e

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Total	131

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