Some code optimization

[mytang0]

What is the purpose of the change

1. Made some modifier optimizations
2. Added some SuppressWarnings

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.

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
11 Code Smells

97.1% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #11683 (8d579ab) into 3.2 (32ada24) will increase coverage by 0.50%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #11683      +/-   ##
============================================
+ Coverage     68.54%   69.05%   +0.50%     
+ Complexity      341        2     -339     
============================================
  Files          3307     1499    -1808     
  Lines        153492    62622   -90870     
  Branches      25424     9219   -16205     
============================================
- Hits         105208    43242   -61966     
+ Misses        38891    15150   -23741     
+ Partials       9393     4230    -5163     

Impacted Files	Coverage Δ
...router/condition/config/AppStateRouterFactory.java	88.88% <0.00%> (-11.12%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0.00%> (-6.90%)	⬇️
...oting/transport/netty4/NettyConnectionHandler.java	53.19% <0.00%> (-6.39%)	⬇️
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0.00%> (-5.27%)	⬇️
...bbo/common/concurrent/CallableSafeInitializer.java	61.90% <0.00%> (-4.77%)	⬇️
...pache/dubbo/common/lang/ShutdownHookCallbacks.java	95.65% <0.00%> (-4.35%)	⬇️
...exchange/support/header/HeaderExchangeHandler.java	61.34% <0.00%> (-2.53%)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	91.83% <0.00%> (-2.05%)	⬇️
...ng/zookeeper/curator5/Curator5ZookeeperClient.java	77.04% <0.00%> (-1.64%)	⬇️
...java/org/apache/dubbo/rpc/cluster/RouterChain.java	80.28% <0.00%> (-1.41%)	⬇️
... and 1827 more

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[EarthChen]

LGTM