Remove Warning for ECS Fargate Origin Detection

[gabedos]

What does this PR do? What is the motivation?

Updates documentation to match existing capabilities for Origin Detection.

Just tested deploying the Agent on ECS Fargate with DogstatsD dummy apps. Sent the custom metrics both via UDS and UDP and the Agent was able to properly resolve the origin and add tags.

The dogstatsd client should be able to attach the ContainerID with the custom metric payload. We are also able to fetch all of the ContainerIDs via the ECS metadata V3 and V4 endpoints.

This doesn't work on EKS Fargate because the kubelet does not expose the ContainerIDs which need to be sourced from the container runtime instead.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/gabedos/update-fargate-tagging-docs/developers/dogstatsd/

[maycmlee]

Thanks for the update!