Feat: Feature toggle admin page frontend interface (#72164)

* feature toggles admin page proto

* feature toggle admin page proto

* keep phase 1 code only

* latest update with api

* fix

* fix

* add correct premissions in admin.go

* move behind toggle

* Use InteractiveTable

* guard behind feature toggle

* use RTK

* route in api.go

* fixes

pkg/api/api.go

@@ -111,6 +111,12 @@ func (hs *HTTPServer) registerRoutes() {
 		r.Get("/admin/storage", reqSignedIn, hs.Index)
 		r.Get("/admin/storage/*", reqSignedIn, hs.Index)
 	}
+
+	// feature toggle admin page
+	if hs.Features.IsEnabled(featuremgmt.FlagFeatureToggleAdminPage) {
+		r.Get("/admin/featuretoggles", authorize(ac.EvalPermission(ac.ActionFeatureManagementRead)), hs.Index)
+	}
+
 	r.Get("/styleguide", reqSignedIn, hs.Index)
 
 	r.Get("/live", reqGrafanaAdmin, hs.Index)