Plugins: Plugin Store API returns DTO model (#41340)

* toying around

* fix refs

* remove unused fields

* go further

* add context

* ensure streaming handler is set

pkg/services/live/live.go

@@ -414,8 +414,8 @@ type GrafanaLive struct {
 }
 
 func (g *GrafanaLive) getStreamPlugin(pluginID string) (backend.StreamHandler, error) {
-	plugin := g.pluginStore.Plugin(pluginID)
-	if plugin == nil {
+	plugin, exists := g.pluginStore.Plugin(context.TODO(), pluginID)
+	if !exists {
 		return nil, fmt.Errorf("plugin not found: %s", pluginID)
 	}
 	if plugin.SupportsStreaming() {