docs(datadog service): Remove datadog specific telemetry (#22927)

chore(docs): Remove datadog specific telemetry These don't exist anymore.

Author: jszwedko

website/cue/reference/components/sources/internal_metrics.cue

@@ -439,18 +439,6 @@ components: sources: internal_metrics: {
 default_namespace: "vector"
 tags: _component_tags & {output: _output}
 }
-datadog_logs_received_in_total: {
-description: "Number of Datadog logs received."
-type: "counter"
-default_namespace: "vector"
-tags: _component_tags
-}
-datadog_metrics_received_in_total: {
-description: "Number of Datadog metrics received."
-type: "counter"
-default_namespace: "vector"
-tags: _component_tags
-}
 internal_metrics_cardinality: {
 description: "The total number of metrics emitted from the internal metrics registry."
 type: "gauge"