[ISSUES #11499] fix address server health check error

[onewe]

Close #11499

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What is the purpose of the change

return UP status when the nacos server doesn't use address-server

Brief changelog

optimize HealthController#isAddressServerHealthy logic

Verifying this change

1. start nacos server using the standalone model
2. curl http://localhost:8848/nacos/v1/cs/health
3. check api result

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[KomachiSion]

Can you add some unit test for this cases？

[codecov-commenter]

Codecov Report

Merging #11508 (b0bcf64) into develop (5880368) will increase coverage by 0.19%.
Report is 2 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #11508      +/-   ##
=============================================
+ Coverage      61.53%   61.73%   +0.19%     
- Complexity      6831     6859      +28     
=============================================
  Files           1066     1066              
  Lines          31599    31645      +46     
  Branches        3251     3257       +6     
=============================================
+ Hits           19445    19535      +90     
+ Misses         10805    10759      -46     
- Partials        1349     1351       +2     

see 17 files with indirect coverage changes

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[onewe]

done