<!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy -->
When outputting to the micrometer, uniformly use serviceKey.
![image](https://github.com/apache/dubbo/assets/38374721/5891ff68-83bf-4298-a48f-a6a1910421bc)


private String application;
    public MetadataIdentifier() {
    }
    public MetadataIdentifier(String serviceInterface, String version, String group, String side, String application) {
        this.serviceInterface = serviceInterface;
        this.version = version;
        this.group = group;
        this.side = side;
        this.application = application;
    }
    public MetadataIdentifier(URL url) {
        this.serviceInterface = url.getServiceInterface();
        this.version = url.getVersion();
        this.group = url.getGroup();
        this.side = url.getSide();
        setApplication(url.getApplication());
    }
    public String getUniqueKey(KeyTypeEnum keyType) {
        return super.getUniqueKey(keyType, application);
    }
    public String getIdentifierKey() {
        return super.getIdentifierKey(application);
    }
    public String getServiceInterface() {
        return serviceInterface;