feat(mixed datasources): continued work on editor design change

pkg/api/datasources.go

@@ -112,5 +112,13 @@ func UpdateDataSource(c *middleware.Context, cmd m.UpdateDataSourceCommand) {
 }
 
 func GetDataSourcePlugins(c *middleware.Context) {
-	c.JSON(200, plugins.DataSources)
+	dsList := make(map[string]interface{})
+
+	for key, value := range plugins.DataSources {
+		if value.(map[string]interface{})["hide"] == nil {
+			dsList[key] = value
+		}
+	}
+
+	c.JSON(200, dsList)
 }

pkg/api/frontendsettings.go

@@ -90,6 +90,11 @@ func getFrontendSettingsMap(c *middleware.Context) (map[string]interface{}, erro
 		"type": "grafana",
 		"meta": grafanaDatasourceMeta,
 	}
+	// add mixed backend data source
+	datasources["mixed"] = map[string]interface{}{
+		"type": "mixed",
+		"meta": plugins.DataSources["mixed"],
+	}
 
 	if defaultDatasource == "" {
 		defaultDatasource = "grafana"