[v9.4.x] Plugins: Prefer to use the data source UID when querying (#62789)

Plugins: Prefer to use the data source UID when querying (#62776)

(cherry picked from commit 68862ce3e8)

Co-authored-by: Andres Martinez Gotor <andres.martinez@grafana.com>

pkg/api/frontendsettings.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strconv"
 
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
@@ -268,7 +267,7 @@ func (hs *HTTPServer) getFSDataSources(c *contextmodel.ReqContext, enabledPlugin
 		url := ds.Url
 
 		if ds.Access == datasources.DS_ACCESS_PROXY {
-			url = "/api/datasources/proxy/" + strconv.FormatInt(ds.Id, 10)
+			url = "/api/datasources/proxy/uid/" + ds.Uid
 		}
 
 		dsDTO := plugins.DataSourceDTO{