[3.0-Triple] fix tri TheadPool is default

[EarthChen]

What is the purpose of the change

#10018

Brief changelog

Verifying this change

Checklist

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[EarthChen]

org.apache.dubbo.rpc.protocol.tri.TripleHttp2Protocol#lookupExecutor

[codecov-commenter]

Codecov Report

Merging #10019 (f32d11f) into 3.0 (7c72487) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.0   #10019      +/-   ##
============================================
- Coverage     65.70%   65.70%   -0.01%     
+ Complexity      319      295      -24     
============================================
  Files          1213     1218       +5     
  Lines         52949    53051     +102     
  Branches       8021     8035      +14     
============================================
+ Hits          34792    34859      +67     
- Misses        14367    14385      +18     
- Partials       3790     3807      +17     

Impacted Files	Coverage Δ
...he/dubbo/rpc/protocol/tri/TripleHttp2Protocol.java	90.38% <100.00%> (+2.88%)	⬆️
.../apache/dubbo/rpc/protocol/tri/TripleProtocol.java	85.00% <100.00%> (+0.58%)	⬆️
...nt/metadata/ServiceInstanceHostPortCustomizer.java	65.78% <0.00%> (-21.06%)	⬇️
...he/dubbo/rpc/listener/ListenerExporterWrapper.java	58.82% <0.00%> (-14.71%)	⬇️
...g/apache/dubbo/remoting/api/ConnectionHandler.java	45.45% <0.00%> (-9.10%)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0.00%> (-7.96%)	⬇️
...o/registry/nacos/util/NacosNamingServiceUtils.java	80.35% <0.00%> (-6.19%)	⬇️
...o/rpc/protocol/tri/transport/GracefulShutdown.java	81.48% <0.00%> (-4.24%)	⬇️
.../dubbo/common/threadlocal/InternalThreadLocal.java	75.34% <0.00%> (-4.07%)	⬇️
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	66.34% <0.00%> (-3.42%)	⬇️
... and 59 more

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[wangchengming666]

maybe use THREAD_POOL_URL here

[wangchengming666]

LGTM

[chickenlj]

LGTM.