Actions: Add a workflow to add pr/external labels (#105326)

.github/pr-commands.json

@@ -253,38 +253,6 @@
     "action": "updateLabel",
     "addLabel": "area/alerting"
   },
-  {
-    "type": "label",
-    "name": "area/alerting",
-    "action": "addToProject",
-    "addToProject": {
-      "url": "https://github.com/orgs/grafana/projects/52"
-    }
-  },
-  {
-    "type": "author",
-    "name": "pr/external",
-    "notMemberOf": {
-      "org": "grafana"
-    },
-    "ignoreList": [
-      "renovate[bot]",
-      "dependabot[bot]",
-      "grafana-delivery-bot[bot]",
-      "grafanabot",
-      "alerting-team[bot]"
-    ],
-    "action": "updateLabel",
-    "addLabel": "pr/external"
-  },
-  {
-    "type": "label",
-    "name": "type/docs",
-    "action": "addToProject",
-    "addToProject": {
-      "url": "https://github.com/orgs/grafana/projects/69"
-    }
-  },
   {
     "type": "changedfiles",
     "matches": [