Call postExecutionUnitOperations in active-expire of writable replicas (#11615)

We need to honor the post-execution-unit API and call it after each KSN

Note that this is an edge case that only happens in case volatile keys were
created directly on a writable replica, and that anyway nothing is propagated to sub-replicas

Co-authored-by: Oran Agra <oran@redislabs.com>

src/expire.c

@@ -396,6 +396,8 @@ void expireSlaveKeys(void) {
                     activeExpireCycleTryExpire(server.db+dbid,expire,start))
                 {
                     expired = 1;
+                    /* DELs aren't propagated, but modules may want their hooks. */
+                    postExecutionUnitOperations();
                 }
 
                 /* If the key was not expired in this DB, we need to set the