Refactor Auth server identity check.

[KomachiSion]

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[github-actions]

Thanks for your this PR. 🙏
Please check again for your PR changes whether contains any usage/api/configuration change such as Add new API , Add new configuration, Change default value of configuration.
If so, please add or update documents(markdown type) in docs/next/ for repository nacos-group/nacos-group.github.io

---

感谢您提交的PR。 🙏
请再次查看您的PR内容，确认是否包含任何使用方式/API/配置参数的变更，如：新增API、新增配置参数、修改默认配置等操作。
如果是，请确保在提交之前，在仓库nacos-group/nacos-group.github.io中的docs/next/目录下添加或更新文档（markdown格式）。

[wuyfee]

$\color{green}{SUCCESS}$
DETAILS
✅ - docker: success
✅ - deploy (standalone & cluster & standalone_auth): success
✅ - e2e-java-test (standalone & cluster & standalone_auth): success
✅ - e2e-go-test (standalone & cluster): success
✅ - e2e-cpp-test (standalone & cluster): success
✅ - e2e-csharp-test (standalone & cluster): success
✅ - e2e-nodejs-test (standalone & cluster): success
✅ - e2e-python-test (standalone & cluster): success
✅ - clean (standalone & cluster & standalone_auth): success

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.40260% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.25%. Comparing base (fb68b7e) to head (5928370).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
...baba/nacos/auth/serveridentity/ServerIdentity.java	83.33%	1 Missing ⚠️
...s/common/remote/client/grpc/GrpcClusterClient.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #12871      +/-   ##
=============================================
+ Coverage      72.17%   72.25%   +0.08%     
- Complexity      9794     9826      +32     
=============================================
  Files           1283     1287       +4     
  Lines          41387    41445      +58     
  Branches        4374     4373       -1     
=============================================
+ Hits           29869    29948      +79     
+ Misses          9414     9394      -20     
+ Partials        2104     2103       -1     

Files with missing lines	Coverage Δ
...libaba/nacos/auth/AbstractProtocolAuthService.java	100.00% <100.00%> (ø)
...om/alibaba/nacos/auth/GrpcProtocolAuthService.java	100.00% <100.00%> (ø)
...om/alibaba/nacos/auth/HttpProtocolAuthService.java	100.00% <100.00%> (ø)
...baba/nacos/auth/serveridentity/DefaultChecker.java	100.00% <100.00%> (ø)
...th/serveridentity/ServerIdentityCheckerHolder.java	100.00% <100.00%> (ø)
...acos/auth/serveridentity/ServerIdentityResult.java	100.00% <100.00%> (ø)
...ba/nacos/common/remote/client/grpc/GrpcClient.java	92.37% <100.00%> (+0.03%)	⬆️
...n/java/com/alibaba/nacos/core/auth/AuthFilter.java	80.00% <100.00%> (+36.06%)	⬆️
...baba/nacos/auth/serveridentity/ServerIdentity.java	83.33% <83.33%> (ø)
...s/common/remote/client/grpc/GrpcClusterClient.java	91.66% <0.00%> (-8.34%)	⬇️

... and 3 files with indirect coverage changes

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[wuyfee]

$\color{green}{SUCCESS}$
DETAILS
✅ - docker: success
✅ - deploy (standalone & cluster & standalone_auth): success
✅ - e2e-java-test (standalone & cluster & standalone_auth): success
✅ - e2e-go-test (standalone & cluster): success
✅ - e2e-cpp-test (standalone & cluster): success
✅ - e2e-csharp-test (standalone & cluster): success
✅ - e2e-nodejs-test (standalone & cluster): success
✅ - e2e-python-test (standalone & cluster): success
✅ - clean (standalone & cluster & standalone_auth): success