osquery generate ecs.yml

[leehinman]

What does this PR do?

• switches to generated ecs.yml field definitions

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).

Related issues

• Relates [ECS] Upgrade modules to ECS 1.11 beats#26967

[elasticmachine]

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Build stats

• Start Time: 2021-08-10T21:02:23.556+0000

• Duration: 18 min 48 sec

• Commit: 709555c

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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