Chore: Add PR Check action enforcing changelog decision (#48728)

.github/pr-checks.json

@@ -7,12 +7,43 @@
     "failure": "Milestone not set"
   },
   {
-    "type": "check-backport",
+    "type": "check-label",
     "title": "Backport Check",
-    "backportEnabled": "Backport enabled",
-    "backportSkipped": "Backport skipped",
-    "failure": "Backport decision needed",
-    "targetUrl": "https://github.com/grafana/grafana/blob/main/contribute/merge-pull-request.md#should-the-pull-request-be-backported",
-    "skipLabels": [ "backport", "no-backport"]
+    "labels": {
+      "exists": "Backport enabled",
+      "notExists": "Backport decision needed",
+      "matches": [
+        "backport v*"
+      ]
+    },
+    "skip": {
+      "message": "Backport skipped",
+      "matches": [
+        "backport",
+        "no-backport"
+      ]
+    },
+    "targetUrl": "https://github.com/grafana/grafana/blob/main/contribute/merge-pull-request.md#should-the-pull-request-be-backported"
+  },
+  {
+    "type": "check-changelog",
+    "title": "Changelog Check",
+    "labels": {
+      "exists": "Changelog enabled",
+      "notExists": "Changelog decision needed",
+      "matches": [
+        "add to changelog"
+      ]
+    },
+    "breakingChangeLabels": [
+      "breaking change"
+    ],
+    "skip": {
+      "message": "Changelog skipped",
+      "matches": [
+        "no-changelog"
+      ]
+    },
+    "targetUrl": "https://github.com/grafana/grafana/blob/main/contribute/merge-pull-request.md#include-in-changelog-and-release-notes"
   }
 ]