FeatureFlags: Revert managing feature flags outside of settings.Cfg (#44382)

* Revert "FeatureToggles: register all enterprise feature toggles (#44336)"

This reverts commit f53b3fb007.

* Revert "FeatureFlags: manage feature flags outside of settings.Cfg (#43692)"

This reverts commit f94c0decbd.

pkg/plugins/manager/dashboards_test.go

@@ -18,6 +18,7 @@ import (
 
 func TestGetPluginDashboards(t *testing.T) {
 	cfg := &setting.Cfg{
+		FeatureToggles: map[string]bool{},
 		PluginSettings: setting.PluginSettings{
 			"test-app": map[string]string{
 				"path": "testdata/test-app",