fix: fix nacos deregister when receiving shutdown signal

[Alanxtl]

fix #3107 in the previous version UnRegisterService, is not invoked at all, this function serves as the deregister hook when receiving shutdown signal. This pr fixes it.

[1kasa]

Looking at it this way, the previous logic seems a bit strange. Our application level supports multiple instance registrations, for example, the service needs to support both the Dubbo protocol and Triple, but it doesn't support unified deregistration?

[Alanxtl]

Looking at it this way, the previous logic seems a bit strange. Our application level supports multiple instance registrations, for example, the service needs to support both the Dubbo protocol and Triple, but it doesn't support unified deregistration?

是支持统一的方式unregister的，在UnRegisterService函数里面调用的s.serviceDiscovery.Unregister(v)函数实际上就是调用对应注册中心的Unregister方法，只不过在之前UnRegisterService函数根本没有被调用，而且serviceDiscoveryRegistry的instances成员根本没有被修改

[codecov-commenter]

Codecov Report

:x: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 37.12%. Comparing base (60d1c2a) to head (fe8495f). :warning: Report is 662 commits behind head on develop.

Files with missing lines	Patch %	Lines
...try/servicediscovery/service_discovery_registry.go	88.88%	2 Missing :warning:
registry/protocol/protocol.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3108      +/-   ##
===========================================
- Coverage    46.76%   37.12%   -9.65%     
===========================================
  Files          295      460     +165     
  Lines        17172    32980   +15808     
===========================================
+ Hits          8031    12243    +4212     
- Misses        8287    19511   +11224     
- Partials       854     1226     +372     

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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