[Cloud Posture] add posture_type field to rule saved object (#149796)

x-pack/plugins/cloud_security_posture/common/schemas/csp_rule_template_metadata.ts

@@ -35,6 +35,7 @@ export const cspRuleTemplateMetadataSchemaV870 = rt.object({
     id: rt.string(),
     version: rt.string(),
     rule_number: rt.maybe(rt.string()),
+    posture_type: rt.maybe(rt.string()),
   }),
   default_value: rt.maybe(rt.string()),
   description: rt.string(),

x-pack/plugins/cloud_security_posture/server/saved_objects/migrations/csp_rule_template.ts

@@ -43,9 +43,19 @@ function migrateCspRuleTemplatesToV870(
 ): SavedObjectUnsanitizedDoc<CspRuleTemplateV870> {
   // Keeps only metadata, deprecated state
   const { muted, enabled, ...attributes } = doc.attributes;
+
   return {
     ...doc,
-    attributes,
+    attributes: {
+      metadata: {
+        ...attributes.metadata,
+        benchmark: {
+          ...attributes.metadata.benchmark,
+          // CSPM introduced in 8.7, so we can assume all docs from 8.4.0 are KSPM
+          posture_type: 'kspm',
+        },
+      },
+    },
   };
 }