Added enrollment_id to fleet-agents (#96498)

* Added enrollment_id to fleet-agents

* Update docs/changelog/96498.yaml

* Delete 96498.yaml

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Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugin/core/src/main/resources/fleet-agents.json

@@ -220,6 +220,9 @@
         "shared_id": {
           "type": "keyword"
         },
+        "enrollment_id": {
+          "type": "keyword"
+        },
         "type": {
           "type": "keyword"
         },