[7.x](backport #26828) Add definition for logging.metrics.enabled, pass config from agent to beats

[mergify]

This is an automatic backport of pull request #26828 done by Mergify.

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[elasticmachine]

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• Start Time: 2021-08-12T17:42:05.710+0000

• Duration: 156 min 17 sec

• Commit: 94930b2

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Test	Results
Failed	0
Passed	52450
Skipped	5265
Total	57715

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Test stats 🧪

Test	Results
Failed	0
Passed	52450
Skipped	5265
Total	57715

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.x/pr-26828 upstream/mergify/bp/7.x/pr-26828
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-26828