[ISSUE#8479]Fix the problem that some singleton classes construction m…

[MRGUOKING]

…ethod not private

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What is the purpose of the change

For #8479

Brief changelog

change two construction methodes of singleton class that below pulgin module from public to private

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[codecov-commenter]

Codecov Report

Merging #8508 (fc2e747) into develop (d8238de) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #8508      +/-   ##
=============================================
+ Coverage      41.10%   41.23%   +0.12%     
- Complexity      4383     4393      +10     
=============================================
  Files            876      876              
  Lines          31862    31862              
  Branches        3709     3709              
=============================================
+ Hits           13096    13137      +41     
+ Misses         17453    17407      -46     
- Partials        1313     1318       +5     

Impacted Files	Coverage Δ
...acos/plugin/auth/spi/server/AuthPluginManager.java	52.63% <100.00%> (ø)
...cos/plugin/encryption/EncryptionPluginManager.java	54.16% <100.00%> (ø)
.../naming/push/v2/NamingSubscriberServiceV2Impl.java	74.41% <0.00%> (-11.63%)	⬇️
...ing/core/v2/index/ClientServiceIndexesManager.java	63.93% <0.00%> (-9.84%)	⬇️
...a/nacos/client/naming/backups/FailoverReactor.java	30.83% <0.00%> (-9.17%)	⬇️
...com/alibaba/nacos/naming/core/v2/pojo/Service.java	72.41% <0.00%> (-6.90%)	⬇️
...cos/naming/core/v2/event/service/ServiceEvent.java	93.33% <0.00%> (-6.67%)	⬇️
...baba/nacos/client/auth/ram/identify/StsConfig.java	66.66% <0.00%> (-5.13%)	⬇️
...s/client/naming/core/ServiceInfoUpdateService.java	64.93% <0.00%> (-2.60%)	⬇️
...a/nacos/core/remote/control/TpsMonitorManager.java	54.54% <0.00%> (-1.30%)	⬇️
... and 16 more

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