Alerting: Migrate to integration schema (#111643)

* update tests to assert against snapshot
* remove channel_config package replaced by schemas from alerting module
* update  references to use new schema

pkg/api/alerting.go

@@ -5,19 +5,48 @@ import (
 	"slices"
 	"strings"
 
+	"github.com/grafana/alerting/notify"
+	"github.com/grafana/alerting/receivers/schema"
+
 	"github.com/grafana/grafana/pkg/api/response"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
-	"github.com/grafana/grafana/pkg/services/ngalert/notifier/channels_config"
 )
 
 func (hs *HTTPServer) GetAlertNotifiers() func(*contextmodel.ReqContext) response.Response {
 	return func(r *contextmodel.ReqContext) response.Response {
+		v2 := notify.GetSchemaForAllIntegrations()
+		slices.SortFunc(v2, func(a, b schema.IntegrationTypeSchema) int {
+			return strings.Compare(string(a.Type), string(b.Type))
+		})
 		if r.Query("version") == "2" {
-			v2 := slices.SortedFunc(channels_config.GetAvailableNotifiersV2(), func(a, b *channels_config.VersionedNotifierPlugin) int {
-				return strings.Compare(a.Type, b.Type)
-			})
 			return response.JSON(http.StatusOK, v2)
 		}
-		return response.JSON(http.StatusOK, channels_config.GetAvailableNotifiers())
+
+		type NotifierPlugin struct {
+			Type        string         `json:"type"`
+			TypeAlias   string         `json:"typeAlias,omitempty"`
+			Name        string         `json:"name"`
+			Heading     string         `json:"heading"`
+			Description string         `json:"description"`
+			Info        string         `json:"info"`
+			Options     []schema.Field `json:"options"`
+		}
+
+		result := make([]*NotifierPlugin, 0, len(v2))
+		for _, s := range v2 {
+			v1, ok := s.GetVersion(schema.V1)
+			if !ok {
+				continue
+			}
+			result = append(result, &NotifierPlugin{
+				Type:        string(s.Type),
+				Name:        s.Name,
+				Description: s.Description,
+				Heading:     s.Heading,
+				Info:        s.Info,
+				Options:     v1.Options,
+			})
+		}
+		return response.JSON(http.StatusOK, result)
 	}
 }