[o365] Upgrade ECS to 8.0.0

[r00tu53r]

Automated PR.

Upgrades ECS to 8.0.0.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-01-24T16:16:50.875+0000

• Duration: 20 min 58 sec

• Commit: bf0d114

Test stats 🧪

Test	Results
Failed	0
Passed	27
Skipped	0
Total	27

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[leehinman]

LGTM