Alerting: remove feature toggle for provisioning API (#50167)

* Alerting: remove feature toggle for provisioning API

* remove missed code parts

* remove unused import

* remove empty line

* mark routes as stable

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

@@ -813,6 +813,13 @@
      "type": "array",
      "x-go-name": "InhibitRules"
     },
+    "muteTimeProvenances": {
+     "additionalProperties": {
+      "$ref": "#/definitions/Provenance"
+     },
+     "type": "object",
+     "x-go-name": "MuteTimeProvenances"
+    },
     "mute_time_intervals": {
      "items": {
       "$ref": "#/definitions/MuteTimeInterval"
@@ -3248,6 +3255,7 @@
    "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "alertGroup": {
+   "description": "AlertGroup alert group",
    "properties": {
     "alerts": {
      "description": "alerts",
@@ -3269,9 +3277,7 @@
     "labels",
     "receiver"
    ],
-   "type": "object",
-   "x-go-name": "AlertGroup",
-   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
+   "type": "object"
   },
   "alertGroups": {
    "description": "AlertGroups alert groups",
@@ -3398,7 +3404,6 @@
    "$ref": "#/definitions/Duration"
   },
   "gettableAlert": {
-   "description": "GettableAlert gettable alert",
    "properties": {
     "annotations": {
      "$ref": "#/definitions/labelSet"
@@ -3457,18 +3462,18 @@
     "status",
     "updatedAt"
    ],
-   "type": "object"
+   "type": "object",
+   "x-go-name": "GettableAlert",
+   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "gettableAlerts": {
+   "description": "GettableAlerts gettable alerts",
    "items": {
     "$ref": "#/definitions/gettableAlert"
    },
-   "type": "array",
-   "x-go-name": "GettableAlerts",
-   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
+   "type": "array"
   },
   "gettableSilence": {
-   "description": "GettableSilence gettable silence",
    "properties": {
     "comment": {
      "description": "comment",
@@ -3520,14 +3525,17 @@
     "status",
     "updatedAt"
    ],
-   "type": "object"
+   "type": "object",
+   "x-go-name": "GettableSilence",
+   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "gettableSilences": {
-   "description": "GettableSilences gettable silences",
    "items": {
     "$ref": "#/definitions/gettableSilence"
    },
-   "type": "array"
+   "type": "array",
+   "x-go-name": "GettableSilences",
+   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "labelSet": {
    "additionalProperties": {
@@ -3656,7 +3664,6 @@
    "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "postableSilence": {
-   "description": "PostableSilence postable silence",
    "properties": {
     "comment": {
      "description": "comment",
@@ -3696,10 +3703,11 @@
     "matchers",
     "startsAt"
    ],
-   "type": "object"
+   "type": "object",
+   "x-go-name": "PostableSilence",
+   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "receiver": {
-   "description": "Receiver receiver",
    "properties": {
     "name": {
      "description": "name",
@@ -3710,7 +3718,9 @@
    "required": [
     "name"
    ],
-   "type": "object"
+   "type": "object",
+   "x-go-name": "Receiver",
+   "x-go-package": "github.com/prometheus/alertmanager/api/v2/models"
   },
   "silence": {
    "description": "Silence silence",