- [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();
    }
```

this.subsetMap = null;
            return;
        }
        Map<String, List<Invoker<?>>> subsetMap = computeSubsetMap(invokerList, vsDestinationGroup.getDestinationRuleList());
        if (subsetMap.size() == 0) {
            this.subsetMap = null;
        } else {
            this.subsetMap = subsetMap;
        }
    }
    protected Map<String, List<Invoker<?>>> computeSubsetMap(List<Invoker<?>> invokers, List<DestinationRule> destinationRules) {
        Map<String, List<Invoker<?>>> subsetMap = new HashMap<>();
        for (DestinationRule destinationRule : destinationRules) {
            DestinationRuleSpec destinationRuleSpec = destinationRule.getSpec();
            List<Subset> subsetList = destinationRuleSpec.getSubsets();
            for (Subset subset : subsetList) {
                String subsetName = subset.getName();
                List<Invoker<?>> subsetInvokerList = new ArrayList<>();
                subsetMap.put(subsetName, subsetInvokerList);
                Map<String, String> labels = subset.getLabels();
                for (Invoker<?> invoker : invokers) {
                    Map<String, String> parameters = invoker.getUrl().getParameters();
                    if (containMapKeyValue(parameters, labels)) {
                        subsetInvokerList.add(invoker);
                    }
                }
            }
        }
        return subsetMap;
    }