[7.x] intake: add cloud.service.name to metadata (#4626)

[axw]

Backports the following commits to 7.x:

• intake: add cloud.service.name to metadata (intake: add cloud.service.name to metadata #4626)

[apmmachine]

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Build stats

• Build Cause: Pull request #4798 opened

• Start Time: 2021-02-18T12:57:13.313+0000

• Duration: 33 min 3 sec

• Commit: 30cbd0c

Test stats 🧪

Test	Results
Failed	0
Passed	4358
Skipped	126
Total	4484

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Run Window tests

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• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

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• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

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• Description: ./.ci/scripts/sync.sh