UI: remove stored token if cluster needs init (#26985)

Author: hashishaw

changelog/26985.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Prevent perpetual loading screen when Vault needs initialization
+```

ui/app/routes/vault/cluster.js

@@ -123,6 +123,10 @@ export default Route.extend(ModelBoundaryRoute, ClusterRoute, {
   afterModel(model, transition) {
     this._super(...arguments);
     this.currentCluster.setCluster(model);
+    if (model.needsInit && this.auth.currentToken) {
+      // clear token to prevent infinite load state
+      this.auth.deleteCurrentToken();
+    }
 
     // Check that namespaces is enabled and if not,
     // clear the namespace by transition to this route w/o it