Resolve #3515174 "Update everything"

Closes #3515174

This just rebases the upstream examples 4.0.x, 8 commits ahead. Brings it up to March, 2025

modules/action_example/src/Plugin/Action/BasicExample.php

@@ -59,7 +59,7 @@ public function execute($object = NULL) {
   /**
    * {@inheritDoc}
    */
-  public function access($object, AccountInterface $account = NULL, $return_as_object = FALSE) {
+  public function access($object, ?AccountInterface $account = NULL, $return_as_object = FALSE) {
     $result = AccessResult::allowed();
     return $return_as_object ? $result : $result->isAllowed();
   }