- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.0.3

### Steps to reproduce this issue

1. 启动 provider `-Ddubbo.application.register-mode=instance`
2. 启动 consumer `dubbo.application.service-discovery.migration=FORCE_APPLICATION`
3. 使用 `dubbo admin` 创建 mesh 路由
4. `org.apache.dubbo.registry.client.InstanceAddressURL#getParameters` 不能获取真正的 url 参数，导致路由规则匹配失败
![image](https://user-images.githubusercontent.com/43994656/134940925-96081a6c-500c-4b71-89cc-bbd22d0be296.png)
5. 原因在于 `getProtocolServiceKey()` 方法是从`RpcContext`中获取，此时获取的`protocolServiceKey` 为 null，导致获取的为 instance 参数，实际需要获取对应服务的参数。
```
    public Map<String, String> getParameters() {
        String protocolServiceKey = getProtocolServiceKey();
        if (StringUtils.isEmpty(protocolServiceKey)) {
            return getInstance().getAllParams();
        }
        return getServiceParameters(protocolServiceKey);
    }
```
```
    public String getProtocolServiceKey() {
        return RpcContext.getServiceContext().getProtocolServiceKey();
    }
```

}
    @Override
    public URL getUrl() {
        return url;
    }
    @Override
    public <T> List<Invoker<T>> route(List<Invoker<T>> invokers, URL url, Invocation invocation) throws RpcException {
        List<DubboRouteDestination> routeDestination = getDubboRouteDestination(invocation);
        if (routeDestination == null) {
            return invokers;
        } else {
            DubboRouteDestination dubboRouteDestination = routeDestination.get(ThreadLocalRandom.current().nextInt(routeDestination.size()));
            DubboDestination dubboDestination = dubboRouteDestination.getDestination();
            String subset = dubboDestination.getSubset();
            List<Invoker<?>> result;
            Map<String, List<Invoker<?>>> subsetMapCopy = this.subsetMap;
            
            if (subsetMapCopy != null) {
                do {
                    result = subsetMapCopy.get(subset);
                    if (CollectionUtils.isNotEmpty(result)) {
                        return (List) result;
                    }
                    dubboRouteDestination = dubboDestination.getFallback();
                    if (dubboRouteDestination == null) {
                        break;
                    }
                    dubboDestination = dubboRouteDestination.getDestination();
                    subset = dubboDestination.getSubset();
                } while (true);