Bridge: Fixes HostTarget use after free when deallocated bridge (#48847)

Summary:
Fixes https://github.com/facebook/react-native/issues/48805 .

## Changelog:

[IOS] [FIXED] - Bridge: Fixes HostTarget use after free when deallocated bridge

Pull Request resolved: https://github.com/facebook/react-native/pull/48847

Test Plan:
Test code:
```
  __weak RCTAlertManager *weakModule;
  autoreleasepool {
    RCTAlertManager *module = [RCTAlertManager new];
    RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:[self sourceURLForBridge:nil]
                                              moduleProvider:^{
      return @[ module ];
    }
                                               launchOptions:nil];
    weakModule = module;
    (void)bridge;
  }
```

Reviewed By: realsoelynn

Differential Revision: D68495576

Pulled By: huntie

fbshipit-source-id: c3086a429f24488ac286ff22d039b8f049ccbffd

packages/react-native/React/Base/RCTBridge.mm

@@ -313,6 +313,7 @@ RCT_NOT_IMPLEMENTED(-(instancetype)init)
 
 - (void)dealloc
 {
+  RCTBridge *batchedBridge = self.batchedBridge;
   /**
    * This runs only on the main thread, but crashes the subclass
    * RCTAssertMainQueue();
@@ -332,7 +333,17 @@ RCT_NOT_IMPLEMENTED(-(instancetype)init)
     RCTExecuteOnMainQueue(^{
       facebook::react::jsinspector_modern::getInspectorInstance().removePage(*inspectorPageId);
       inspectorPageId.reset();
-      inspectorTarget.reset();
+      // NOTE: RCTBridgeHostTargetDelegate holds a weak reference to RCTBridge.
+      // Conditionally call `inspectorTarget.reset()` to avoid a crash.
+      if (batchedBridge) {
+        [batchedBridge
+            dispatchBlock:^{
+              inspectorTarget.reset();
+            }
+                    queue:RCTJSThread];
+      } else {
+        inspectorTarget.reset();
+      }
     });
   }
 }