Fleet: Add a new mapping for .fleet-actions-results action_input_type field (#84316)

* Fleet: Add a new mapping for .fleet-actions-results input_type field

* Update docs/changelog/84316.yaml

* Rename input_type to action_input_type as requested for fleet/agent PRs

* Update changelog

docs/changelog/84316.yaml

@@ -0,0 +1,5 @@
+pr: 84316
+summary: "Fleet: Add a new mapping for .fleet-actions-results `action_input_type` field"
+area: Security
+type: enhancement
+issues: []

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

@@ -16,6 +16,9 @@
         "action_id": {
           "type": "keyword"
         },
+        "action_input_type": {
+          "type": "keyword"
+        },
         "agent_id": {
           "type": "keyword"
         },