Docs: update Datadog integration diagram

[leandrodamascena]

What were you searching in the docs?

Fix Datadog integration diagram

Is this related to an existing documentation section?

https://docs.powertools.aws.dev/lambda/python/develop/core/metrics/datadog/

How can we improve?

Update diagram

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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