Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/build/docker/grafana/dashboards/home.json

@@ -0,0 +1,129 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "id": 5,
+  "links": [],
+  "panels": [
+    {
+      "datasource": null,
+      "fieldConfig": {
+        "defaults": {
+          "custom": {}
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 3,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1,
+      "title": "",
+      "type": "welcome"
+    },
+    {
+      "datasource": null,
+      "fieldConfig": {
+        "defaults": {
+          "custom": {}
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 15,
+        "w": 12,
+        "x": 0,
+        "y": 3
+      },
+      "headings": true,
+      "id": 3,
+      "limit": 30,
+      "links": [],
+      "query": "Mattermost",
+      "recent": false,
+      "search": true,
+      "starred": false,
+      "tags": [],
+      "title": "Dashboards",
+      "type": "dashlist"
+    },
+    {
+      "datasource": null,
+      "fieldConfig": {
+        "defaults": {
+          "custom": {}
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 15,
+        "w": 12,
+        "x": 12,
+        "y": 3
+      },
+      "id": 4,
+      "links": [],
+      "options": {
+        "feedUrl": "https://grafana.com/blog/news.xml"
+      },
+      "title": "Latest from the blog",
+      "type": "news"
+    }
+  ],
+  "schemaVersion": 26,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": []
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "timepicker": {
+    "hidden": true,
+    "refresh_intervals": [
+      "5s",
+      "10s",
+      "30s",
+      "1m",
+      "5m",
+      "15m",
+      "30m",
+      "1h",
+      "2h",
+      "1d"
+    ],
+    "time_options": [
+      "5m",
+      "15m",
+      "1h",
+      "6h",
+      "12h",
+      "24h",
+      "2d",
+      "7d",
+      "30d"
+    ],
+    "type": "timepicker"
+  },
+  "timezone": "browser",
+  "title": "Home",
+  "uid": "4yRNKfaGz",
+  "version": 1
+}