Log start of activity processing so we can debug if it crashes before finishing

Civi/UpdaterecurWorker.php

@@ -84,6 +84,7 @@ class UpdaterecurWorker {
 
     $success = FALSE;
     try {
+      \Civi::log()->notice("updaterecur: start processing activity {$changeActivity['id']}.");
       $activityUpdated['details'] .= E::ts("<p>" . date('Y-m-d H:i:s') . " Beginning processing</p>\n");
       $recur = $this->loadAndCheckRecurRecord($changeActivity['updaterecur_activity_fields.updaterecur_recur_id'] ?? 0);
       $activityUpdated['details'] .= E::ts("<p>Found recurring contribution, status: <em>%1</em>, payment processor: <em>%2</em>, processor ID: <code>%3</code></p>\n",