[Matter.framework] Clear all device controller delegates on controlle…

…r shutdown (#35935)

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -313,7 +313,7 @@ - (void)_controllerResumed
 
 - (void)shutdown
 {
-    // Subclass hook; nothing to do.
+    [self _clearDeviceControllerDelegates];
 }
 
 - (nullable NSNumber *)controllerNodeID
@@ -671,6 +671,14 @@ - (void)removeDeviceControllerDelegate:(id<MTRDeviceControllerDelegate>)delegate
     }
 }
 
+- (void)_clearDeviceControllerDelegates
+{
+    @synchronized(self) {
+        _strongDelegateForSetDelegateAPI = nil;
+        [_delegates removeAllObjects];
+    }
+}
+
 // Iterates the delegates, and remove delegate info objects if the delegate object has dealloc'ed
 // Returns number of delegates called
 - (NSUInteger)_iterateDelegateInfoWithBlock:(void (^_Nullable)(MTRDeviceControllerDelegateInfo * delegateInfo))block

src/darwin/Framework/CHIP/MTRDeviceController_Concrete.mm

@@ -418,6 +418,7 @@ - (void)shutdown
         return;
     }
     [self finalShutdown];
+    [super shutdown];
 }
 
 - (void)finalShutdown