fix(datadog): enable datadog source for edge

[zeldanut]

previously disabled. enable to allow for receiving datadog log/metrics/traces on Edge.

$ ❯ cat test.yaml
sources:
  my_source_id:
    type: datadog_agent
    address: 0.0.0.0:8978
    split_metric_namespace: true
    store_api_key: true

sinks:
  blacks:
    type: blackhole
    inputs:
      - my_source_id

$ ❯ vector validate --config-yaml ./test.yaml
√ Loaded ["test.yaml"]
√ Component configuration
√ Health check "blacks"
-------------------------
                Validated

ref: LOG-22955

[logdnabot]

🎉 This PR is included in version 6.6.2 🎉

The release is available on GitHub release

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