Update build tools changelog schema for new Core/Infra/Metrics label

[pgomulka]

a new Core/Infra/Metrics label has been added, this commit updates the schema

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[elasticsearchmachine]

Pinging @elastic/es-delivery (Team:Delivery)

[elasticsearchmachine]

💚 Backport successful

Status	Branch	Result
✅	7.17
✅	8.12