Alerting: Update RuleGroupConfig definitions with missing fields (#115850)

* Alerting: Update RuleGroupConfig definitions with missing fields

This update adds previously missing fields to the `RuleGroupConfig` structs to
ensure compatibility with external Prometheus-like rulers.

Includes:
- `labels`: per https://github.com/prometheus/prometheus/pull/11474
- `remote_write`: per https://github
.com/grafana/mimir/blob/56f33fed6254fee5a53bde1eab36c604863e3d5f/pkg/mimirtool/rules/rwrulefmt/rulefmt.go#L16

Note: This does not add full support in Grafana; it only allows these fields to
pass through the alerting proxy without causing unmarshal errors when using
external rulers.

* Update OpenAPI spec

pkg/services/ngalert/api/tooling/api.json

@@ -647,12 +647,6 @@
   },
   "BacktestConfig": {
    "properties": {
-    "annotations": {
-     "additionalProperties": {
-      "type": "string"
-     },
-     "type": "object"
-    },
     "condition": {
      "type": "string"
     },
@@ -662,8 +656,16 @@
      },
      "type": "array"
     },
+    "exec_err_state": {
+     "enum": [
+      "OK",
+      "Alerting",
+      "Error"
+     ],
+     "type": "string"
+    },
     "for": {
-     "$ref": "#/definitions/Duration"
+     "type": "string"
     },
     "from": {
      "format": "date-time",
@@ -672,12 +674,22 @@
     "interval": {
      "$ref": "#/definitions/Duration"
     },
+    "keep_firing_for": {
+     "type": "string"
+    },
     "labels": {
      "additionalProperties": {
       "type": "string"
      },
      "type": "object"
     },
+    "missing_series_evals_to_resolve": {
+     "format": "int64",
+     "type": "integer"
+    },
+    "namespace_uid": {
+     "type": "string"
+    },
     "no_data_state": {
      "enum": [
       "Alerting",
@@ -686,12 +698,18 @@
      ],
      "type": "string"
     },
+    "rule_group": {
+     "type": "string"
+    },
     "title": {
      "type": "string"
     },
     "to": {
      "format": "date-time",
      "type": "string"
+    },
+    "uid": {
+     "type": "string"
     }
    },
    "type": "object"
@@ -1813,6 +1831,12 @@
     "interval": {
      "$ref": "#/definitions/Duration"
     },
+    "labels": {
+     "additionalProperties": {
+      "type": "string"
+     },
+     "type": "object"
+    },
     "limit": {
      "format": "int64",
      "type": "integer"
@@ -1823,6 +1847,12 @@
     "query_offset": {
      "type": "string"
     },
+    "remote_write": {
+     "items": {
+      "$ref": "#/definitions/RemoteWriteConfig"
+     },
+     "type": "array"
+    },
     "rules": {
      "items": {
       "$ref": "#/definitions/GettableExtendedRuleNode"
@@ -3142,6 +3172,12 @@
     "interval": {
      "$ref": "#/definitions/Duration"
     },
+    "labels": {
+     "additionalProperties": {
+      "type": "string"
+     },
+     "type": "object"
+    },
     "limit": {
      "format": "int64",
      "type": "integer"
@@ -3152,6 +3188,12 @@
     "query_offset": {
      "type": "string"
     },
+    "remote_write": {
+     "items": {
+      "$ref": "#/definitions/RemoteWriteConfig"
+     },
+     "type": "array"
+    },
     "rules": {
      "items": {
       "$ref": "#/definitions/PostableExtendedRuleNode"
@@ -3817,6 +3859,14 @@
    },
    "type": "object"
   },
+  "RemoteWriteConfig": {
+   "properties": {
+    "url": {
+     "type": "string"
+    }
+   },
+   "type": "object"
+  },
   "ResponseDetails": {
    "properties": {
     "msg": {
@@ -4093,6 +4143,12 @@
     "interval": {
      "$ref": "#/definitions/Duration"
     },
+    "labels": {
+     "additionalProperties": {
+      "type": "string"
+     },
+     "type": "object"
+    },
     "limit": {
      "format": "int64",
      "type": "integer"
@@ -4103,6 +4159,12 @@
     "query_offset": {
      "type": "string"
     },
+    "remote_write": {
+     "items": {
+      "$ref": "#/definitions/RemoteWriteConfig"
+     },
+     "type": "array"
+    },
     "rules": {
      "items": {
       "$ref": "#/definitions/GettableExtendedRuleNode"