ngalert openapi: Use same basePath as rest of Grafana (#79025)

* ngalert openapi: Use same `basePath` as rest of Grafana
Currently, there are two issues that prevent easily merging `ngalert` and grafana openapi specs:
- The basePath is different. `grafana` has `/api` and `ngalert` has `/api/v1`. I changed `ngalert` to use `/api`
- The `ngalert` endpoints have their basePath in the each operation path. The basePath should actually be omitted
---------

Co-authored-by: Yuriy Tseretyan <yuriy.tseretyan@grafana.com>

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

@@ -1,5 +1,5 @@
 {
- "basePath": "/api/v1",
+ "basePath": "/api",
  "consumes": [
   "application/json"
  ],
@@ -4414,7 +4414,6 @@
    "type": "object"
   },
   "alertGroup": {
-   "description": "AlertGroup alert group",
    "properties": {
     "alerts": {
      "description": "alerts",
@@ -4438,6 +4437,7 @@
    "type": "object"
   },
   "alertGroups": {
+   "description": "AlertGroups alert groups",
    "items": {
     "$ref": "#/definitions/alertGroup"
    },
@@ -4542,6 +4542,7 @@
    "type": "object"
   },
   "gettableAlert": {
+   "description": "GettableAlert gettable alert",
    "properties": {
     "annotations": {
      "$ref": "#/definitions/labelSet"
@@ -4597,7 +4598,6 @@
    "type": "object"
   },
   "gettableAlerts": {
-   "description": "GettableAlerts gettable alerts",
    "items": {
     "$ref": "#/definitions/gettableAlert"
    },
@@ -4652,13 +4652,13 @@
    "type": "object"
   },
   "gettableSilences": {
-   "description": "GettableSilences gettable silences",
    "items": {
     "$ref": "#/definitions/gettableSilence"
    },
    "type": "array"
   },
   "integration": {
+   "description": "Integration integration",
    "properties": {
     "lastNotifyAttempt": {
      "description": "A timestamp indicating the last attempt to deliver a notification regardless of the outcome.\nFormat: date-time",
@@ -4840,6 +4840,7 @@
    "type": "object"
   },
   "receiver": {
+   "description": "Receiver receiver",
    "properties": {
     "active": {
      "description": "active",
@@ -4959,7 +4960,7 @@
   "version": "1.1.0"
  },
  "paths": {
-  "/api/v1/provisioning/alert-rules": {
+  "/v1/provisioning/alert-rules": {
    "get": {
     "operationId": "RouteGetAlertRules",
     "responses": {
@@ -5014,7 +5015,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/alert-rules/export": {
+  "/v1/provisioning/alert-rules/export": {
    "get": {
     "operationId": "RouteGetAlertRulesExport",
     "parameters": [
@@ -5071,7 +5072,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/alert-rules/{UID}": {
+  "/v1/provisioning/alert-rules/{UID}": {
    "delete": {
     "operationId": "RouteDeleteAlertRule",
     "parameters": [
@@ -5171,7 +5172,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/alert-rules/{UID}/export": {
+  "/v1/provisioning/alert-rules/{UID}/export": {
    "get": {
     "operationId": "RouteGetAlertRuleExport",
     "parameters": [
@@ -5219,7 +5220,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/contact-points": {
+  "/v1/provisioning/contact-points": {
    "get": {
     "operationId": "RouteGetContactpoints",
     "parameters": [
@@ -5282,7 +5283,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/contact-points/export": {
+  "/v1/provisioning/contact-points/export": {
    "get": {
     "operationId": "RouteGetContactpointsExport",
     "parameters": [
@@ -5334,7 +5335,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/contact-points/{UID}": {
+  "/v1/provisioning/contact-points/{UID}": {
    "delete": {
     "consumes": [
      "application/json"
@@ -5405,7 +5406,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/folder/{FolderUID}/rule-groups/{Group}": {
+  "/v1/provisioning/folder/{FolderUID}/rule-groups/{Group}": {
    "get": {
     "operationId": "RouteGetAlertRuleGroup",
     "parameters": [
@@ -5489,7 +5490,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/folder/{FolderUID}/rule-groups/{Group}/export": {
+  "/v1/provisioning/folder/{FolderUID}/rule-groups/{Group}/export": {
    "get": {
     "operationId": "RouteGetAlertRuleGroupExport",
     "parameters": [
@@ -5542,7 +5543,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/mute-timings": {
+  "/v1/provisioning/mute-timings": {
    "get": {
     "operationId": "RouteGetMuteTimings",
     "responses": {
@@ -5597,7 +5598,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/mute-timings/export": {
+  "/v1/provisioning/mute-timings/export": {
    "get": {
     "operationId": "RouteExportMuteTimings",
     "parameters": [
@@ -5636,7 +5637,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/mute-timings/{name}": {
+  "/v1/provisioning/mute-timings/{name}": {
    "delete": {
     "operationId": "RouteDeleteMuteTiming",
     "parameters": [
@@ -5737,7 +5738,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/mute-timings/{name}/export": {
+  "/v1/provisioning/mute-timings/{name}/export": {
    "get": {
     "operationId": "RouteExportMuteTiming",
     "parameters": [
@@ -5783,7 +5784,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/policies": {
+  "/v1/provisioning/policies": {
    "delete": {
     "consumes": [
      "application/json"
@@ -5857,7 +5858,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/policies/export": {
+  "/v1/provisioning/policies/export": {
    "get": {
     "operationId": "RouteGetPolicyTreeExport",
     "responses": {
@@ -5880,7 +5881,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/templates": {
+  "/v1/provisioning/templates": {
    "get": {
     "operationId": "RouteGetTemplates",
     "responses": {
@@ -5900,7 +5901,7 @@
     ]
    }
   },
-  "/api/v1/provisioning/templates/{name}": {
+  "/v1/provisioning/templates/{name}": {
    "delete": {
     "operationId": "RouteDeleteTemplate",
     "parameters": [