[AI Gateway] Add Datadog as a supported OTEL backend

[Kyle-Verhoog]

Summary

• Adds Datadog to the list of Common OTEL Backends on the AI Gateway OpenTelemetry integration page, alongside Honeycomb, Braintrust, and Langfuse.

Test plan

• Verify the link renders correctly and matches the style of the other backend links

[cloudflare-docs-bot]

Review

✅ No issues found in commit 0a2eafa.

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