Remove mandatory backport checks (#78678)

* Remove mandatory backport checks

* update backporting docs

.github/pr-checks.json

@@ -6,25 +6,6 @@
     "success": "Milestone set",
     "failure": "Milestone not set"
   },
-  {
-    "type": "check-label",
-    "title": "Backport Check",
-    "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",

.github/renovate.json5

@@ -11,7 +11,7 @@
   ],
   "includePaths": ["package.json", "packages/**", "public/app/plugins/**"],
   "ignorePaths": ["emails/**", "plugins-bundled/**", "**/mocks/**", "packages/grafana-e2e/**"],
-  "labels": ["area/frontend", "dependencies", "no-backport", "no-changelog"],
+  "labels": ["area/frontend", "dependencies", "no-changelog"],
   "postUpdateOptions": ["yarnDedupeHighest"],
   "packageRules": [
     {

.github/workflows/alerting-swagger-gen.yml

@@ -31,7 +31,7 @@ jobs:
             Please review and merge.
           branch: update-alerting-swagger-spec
           delete-branch: true
-          labels: 'area/alerting,type/docs,no-backport,no-changelog'
+          labels: 'area/alerting,type/docs,no-changelog'
           team-reviewers: 'grafana/alerting-backend-product'
           draft: false