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

pkg/plugins/manager/loader/loader.go

@@ -93,10 +93,8 @@ func (l *Loader) Load(ctx context.Context, src plugins.PluginSource) ([]*plugins
 	}
 	validateResults := make(chan validateResult, len(bootstrappedPlugins))
 
-	// If the PluginsCDNSyncLoaderEnabled feature is enabled, validate plugins in parallel.
-	// Otherwise, validate plugins sequentially.
 	var limitSize int
-	if l.cfg.Features.PluginsCDNSyncLoaderEnabled && src.PluginClass(ctx) == plugins.ClassCDN {
+	if src.PluginClass(ctx) == plugins.ClassCDN {
 		limitSize = min(len(bootstrappedPlugins), concurrencyLimit)
 	} else {
 		limitSize = 1