fix broadcast log format bug

[xiaoheng1]

What is the purpose of the change

fix broadcast log format bug

see #8480

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.
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• 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.
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[codecov-commenter]

Codecov Report

Merging #8484 (f9cdace) into 3.0 (2f099bd) will decrease coverage by 0.36%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                3.0    #8484      +/-   ##
============================================
- Coverage     63.19%   62.82%   -0.37%     
- Complexity      310      312       +2     
============================================
  Files          1103     1112       +9     
  Lines         46230    46620     +390     
  Branches       6978     7012      +34     
============================================
+ Hits          29215    29291      +76     
- Misses        13729    14065     +336     
+ Partials       3286     3264      -22     

Impacted Files	Coverage Δ
...o/rpc/cluster/support/BroadcastClusterInvoker.java	0.00% <0.00%> (ø)
...ache/dubbo/rpc/protocol/tri/UnaryClientStream.java	24.59% <0.00%> (-28.99%)	⬇️
...ing/context/DubboBootstrapApplicationListener.java	60.00% <0.00%> (-22.00%)	⬇️
...apache/dubbo/rpc/protocol/tri/Http2HeaderMeta.java	55.55% <0.00%> (-19.45%)	⬇️
...apache/dubbo/rpc/protocol/tri/DefaultMetadata.java	58.33% <0.00%> (-11.67%)	⬇️
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	⬇️
.../apache/dubbo/rpc/protocol/tri/AbstractStream.java	45.45% <0.00%> (-11.07%)	⬇️
.../org/apache/dubbo/rpc/protocol/tri/TripleUtil.java	35.33% <0.00%> (-10.36%)	⬇️
...g/context/DubboInfraBeanRegisterPostProcessor.java	93.33% <0.00%> (-6.67%)	⬇️
...cluster/router/mesh/route/MeshAppRuleListener.java	77.50% <0.00%> (-6.29%)	⬇️
... and 56 more

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