Add ingest pipeline for rerouting

If available, the reroute processor uses the pod's dataset and
namespace labels, fallback to the values configured in the agent
policy.

refs: elastic#6845

Author: zmoog

packages/kubernetes/data_stream/container_logs/elasticsearch/ingest_pipeline/default.yml

@@ -0,0 +1,13 @@
+---
+description: Pipeline for parsing container logs
+processors:
+  - set:
+      field: ecs.version
+      value: '8.8.0'
+  - reroute:
+      dataset:
+        - '{{kubernetes.labels.elastic_co/dataset}}'
+        - '{{data_stream.dataset}}'
+      namespace:
+        - '{{kubernetes.labels.elastic_co/namespace}}'
+        - '{{data_stream.namespace}}'