fix:nacos service provider does not require subscribe

[kzhan]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #1056 (e6dd108) into develop (5c76040) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #1056      +/-   ##
===========================================
- Coverage    59.51%   59.39%   -0.12%     
===========================================
  Files          261      261              
  Lines        12960    12963       +3     
===========================================
- Hits          7713     7700      -13     
- Misses        4272     4290      +18     
+ Partials       975      973       -2     

Impacted Files	Coverage Δ
registry/nacos/registry.go	49.28% <0.00%> (-1.08%)	⬇️
remoting/kubernetes/registry_controller.go	46.12% <0.00%> (-5.31%)	⬇️
remoting/kubernetes/watch.go	76.92% <0.00%> (-2.20%)	⬇️
cluster/cluster_impl/failback_cluster_invoker.go	75.90% <0.00%> (+2.40%)	⬆️

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