mixin: add a dashboard per tab next to the full dashboard (#2678)

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

dashboard/windows-exporter-dashboard.json

@@ -2,7 +2,7 @@
     "apiVersion": "dashboard.grafana.app/v2",
     "kind": "Dashboard",
     "metadata": {
-        "name": "Kdaassddw"
+        "name": "windows-exporter-full"
     },
     "spec": {
         "annotations": [
@@ -30311,7 +30311,7 @@
             "hideTimepicker": false,
             "to": "now"
         },
-        "title": "Windows Exporter",
+        "title": "Windows Exporter / Full",
         "variables": [
             {
                 "kind": "DatasourceVariable",
@@ -30443,39 +30443,6 @@
                     "sort": "alphabeticalAsc"
                 }
             },
-            {
-                "kind": "QueryVariable",
-                "spec": {
-                    "allowCustomValue": true,
-                    "current": {
-                        "text": "",
-                        "value": ""
-                    },
-                    "definition": "label_values(windows_os_hostname{job=~\"$job\", instance=\"$instance\"}, hostname)",
-                    "hide": "hideVariable",
-                    "includeAll": false,
-                    "multi": false,
-                    "name": "show_hostname",
-                    "options": [],
-                    "query": {
-                        "datasource": {
-                            "name": "${datasource}"
-                        },
-                        "group": "prometheus",
-                        "kind": "DataQuery",
-                        "spec": {
-                            "qryType": 1,
-                            "query": "label_values(windows_os_hostname{job=~\"$job\", instance=\"$instance\"}, hostname)",
-                            "refId": "PrometheusVariableQueryEditor-VariableQuery"
-                        },
-                        "version": "v0"
-                    },
-                    "refresh": "onTimeRangeChanged",
-                    "regex": "",
-                    "skipUrlSync": false,
-                    "sort": "alphabeticalAsc"
-                }
-            },
             {
                 "kind": "QueryVariable",
                 "spec": {