Add `experimental-enable-actions` flag to FE (#22590)

* Add flag to setting names type

* Add writeback on/off selector

frontend/src/metabase/lib/settings.ts

@@ -66,6 +66,7 @@ export type SettingName =
   | "enable-enhancements?"
   | "enable-public-sharing"
   | "enable-xrays"
+  | "experimental-enable-actions"
   | "persisted-models-enabled"
   | "engines"
   | "ga-code"

frontend/src/metabase/writeback/selectors.ts

+import { getSetting } from "metabase/selectors/settings";
+import { State } from "metabase-types/store";
+
+export function getWritebackEnabled(state: State) {
+  return getSetting(state, "experimental-enable-actions");
+}