### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Electron Version

12.0.1

### What operating system are you using?

macOS

### Operating System Version

11.2

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

`error.message` shouldn't be prefixed with "Uncaught Error:"

### Actual Behavior

`error.message` is prefixed with "Uncaught Error:" when an error is thrown in a function defined in the preload script and caught in the renderer process. This only happens when `contextIsolation` is enabled.

### Testcase Gist URL

https://gist.github.com/f11c77f9bc2cbf98d42a9fcaf477c80a


shell/renderer/api/electron_api_context_bridge.cc
support_dynamic_properties, recursion_depth + 1);
      if (value_for_array.IsEmpty())
        return v8::MaybeLocal<v8::Value>();
      if (!IsTrue(cloned_arr->Set(destination_context, static_cast<int>(i),
                                  value_for_array.ToLocalChecked()))) {
        return v8::MaybeLocal<v8::Value>();
      }
    }
    object_cache->CacheProxiedObject(value, cloned_arr);
    return v8::MaybeLocal<v8::Value>(cloned_arr);
  }
  
  blink::WebElement elem = blink::WebElement::FromV8Value(value);
  if (!elem.IsNull()) {
    v8::Context::Scope destination_context_scope(destination_context);
    return v8::MaybeLocal<v8::Value>(elem.ToV8Value(
        destination_context->Global(), destination_context->GetIsolate()));
  }
  
  if (IsPlainObject(value)) {
    auto object_value = v8::Local<v8::Object>::Cast(value);
    auto passed_value = CreateProxyForAPI(
        object_value, source_context, destination_context, object_cache,
        support_dynamic_properties, recursion_depth + 1);
    if (passed_value.IsEmpty())
      return v8::MaybeLocal<v8::Value>();
    return v8::MaybeLocal<v8::Value>(passed_value.ToLocalChecked());
  }
  
  blink::CloneableMessage ret;