Revert "Update CHANGELOG.md for 12.1.15"

This reverts commit 2404e6c7.

CHANGELOG.md

@@ -2,14 +2,6 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
-## 12.1.15
-
-### Security (2 changes)
-
-- Sanitize search text to prevent XSS.
-- Fix stored XSS issue for grafana_url.
-
-
 ## 12.1.14
 - No changes.

changelogs/unreleased/security-stored-xss-using-find-file.yml

+---
+title: Sanitize search text to prevent XSS
+merge_request:
+author:
+type: security

changelogs/unreleased/security-xss-grafana-url-12-4.yml

+---
+title: Fix stored XSS issue for grafana_url
+merge_request:
+author:
+type: security