improve the code that RegistryDirectory.java#destroyUnusedInvokers an…

[zhongxiongzeng]

…d RegistryDirectory.java#toMergeInvokerList

What is the purpose of the change

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 #7902 (efd84a3) into master (a7ae94d) will increase coverage by 0.09%.
The diff coverage is 55.55%.

@@             Coverage Diff              @@
##             master    #7902      +/-   ##
============================================
+ Coverage     60.04%   60.14%   +0.09%     
- Complexity      543      544       +1     
============================================
  Files          1089     1089              
  Lines         43858    43836      -22     
  Branches       6403     6396       -7     
============================================
+ Hits          26336    26364      +28     
+ Misses        14575    14527      -48     
+ Partials       2947     2945       -2     

Impacted Files	Coverage Δ
.../dubbo/registry/integration/RegistryDirectory.java	76.17% <55.55%> (-0.02%)	⬇️
.../dubbo/monitor/support/AbstractMonitorFactory.java	80.00% <0.00%> (-3.34%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	78.14% <0.00%> (-1.49%)	⬇️
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	64.87% <0.00%> (-0.62%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	81.37% <0.00%> (-0.23%)	⬇️
...pache/dubbo/remoting/telnet/codec/TelnetCodec.java	51.23% <0.00%> (+0.61%)	⬆️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	88.57% <0.00%> (+1.90%)	⬆️
.../exchange/support/header/HeaderExchangeServer.java	66.66% <0.00%> (+1.90%)	⬆️
...e/dubbo/remoting/exchange/codec/ExchangeCodec.java	80.16% <0.00%> (+2.42%)	⬆️
.../remoting/transport/netty4/NettyClientHandler.java	86.44% <0.00%> (+3.38%)	⬆️
... and 6 more

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