Optimize the ThreadPoolStatusCheckerTest test case

[xiaoheng1]

What is the purpose of the change

Optimize the ThreadPoolStatusCheckerTest test case

see more detail from #8022

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8023 (106e9c8) into master (c8d176f) will increase coverage by 0.54%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8023      +/-   ##
============================================
+ Coverage     60.47%   61.02%   +0.54%     
- Complexity      456      490      +34     
============================================
  Files          1090     1090              
  Lines         43937    43951      +14     
  Branches       6420     6423       +3     
============================================
+ Hits          26571    26820     +249     
+ Misses        14402    14145     -257     
- Partials       2964     2986      +22     

Impacted Files	Coverage Δ
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	⬇️
...port/identifier/BaseServiceMetadataIdentifier.java	53.57% <0.00%> (-7.15%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-6.90%)	⬇️
...apache/dubbo/common/config/ConfigurationUtils.java	67.74% <0.00%> (-1.01%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	81.02% <0.00%> (-0.26%)	⬇️
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	54.53% <0.00%> (-0.05%)	⬇️
...org/apache/dubbo/config/context/ConfigManager.java	81.28% <0.00%> (ø)
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	64.73% <0.00%> (ø)
...ache/dubbo/config/utils/ConfigValidationUtils.java	73.82% <0.00%> (ø)
...n/java/org/apache/dubbo/common/utils/NetUtils.java	69.30% <0.00%> (+0.33%)	⬆️
... and 33 more

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[BurningCN]

LGTM