Persist ReplayFlowFactoryAction#sandbox

In CBCI HA scenarios, the Queue.Item (and its actions) can be rescheduled in another Jenkins replica. In such case it is required to persist the `sandbox` field, otherwise the reschedule will run without sandbox.

plugin/src/main/java/org/jenkinsci/plugins/workflow/cps/replay/ReplayFlowFactoryAction.java

@@ -52,7 +52,7 @@ class ReplayFlowFactoryAction extends InvisibleAction implements CpsFlowFactoryA
 
     private String replacementMainScript;
     private final Map<String,String> replacementLoadedScripts;
-    private transient final boolean sandbox;
+    private final boolean sandbox;
 
     ReplayFlowFactoryAction(@NonNull String replacementMainScript, @NonNull Map<String,String> replacementLoadedScripts, boolean sandbox) {
         this.replacementMainScript = replacementMainScript;