[Darwin] MTRDevice subscription onDone callback needs to acquire lock (project-chip#37675)

Author: jtung-apple

src/darwin/Framework/CHIP/MTRDevice_Concrete.mm

@@ -2887,6 +2887,7 @@ - (void)_setupSubscriptionWithReason:(NSString *)reason
                                    [matterCPPObjectsHolder setReadClient:nullptr subscriptionCallback:nullptr];
 
                                    // OnDone
+                                   std::lock_guard lock(self->_lock);
                                    [self _doHandleSubscriptionReset:nil];
                                },
                                ^(void) {