ES|QL CCS GA release notes highlight (#130032)

* ESQL CCS GA

Author: smalyshev

docs/changelog/130032.yaml

@@ -0,0 +1,12 @@
+pr: 130032
+summary: ES|QL cross-cluster querying is now generally available
+area: ES|QL
+type: feature
+issues: []
+highlight:
+  title: ES|QL cross-cluster querying is now generally available
+  body: |-
+    The ES|QL Cross-Cluster querying feature has been in technical preview since 8.13.
+    As of releases 8.19.0 and 9.1.0 this is now generally available.
+    This feature allows you to run ES|QL queries across multiple clusters.
+  notable: true