Plugins: Remove pluginsCDNSyncLoader feature toggle (#108389)

* remove pluginsCDNSyncLoader feature toggle

* fix lint issues

* fix other linter issue

pkg/plugins/config/config.go

@@ -30,10 +30,9 @@ type PluginManagementCfg struct {
 
 // Features contains the feature toggles used for the plugin management system.
 type Features struct {
-	SkipHostEnvVarsEnabled      bool
-	SriChecksEnabled            bool
-	PluginsCDNSyncLoaderEnabled bool
-	LocalizationForPlugins      bool
+	SkipHostEnvVarsEnabled bool
+	SriChecksEnabled       bool
+	LocalizationForPlugins bool
 	// Needed only until Tempo Alerting / metrics TraceQL is stable
 	// https://github.com/grafana/grafana/issues/106888
 	TempoAlertingEnabled bool