[3.3] Log warning message at method exceptionCaught of Netty handlers

[zrlw]

What is the purpose of the change?

there are no exception log information when Netty server or client occurs exception, for example, NettyHandler#exceptionCaught catched server exception but does not log any exception information, only disconnected info was logged:

3.3.4-SNAPSHOT, current host: 10.1.0.250
12:21:36.654 |-INFO  [New I/O server worker #3-5] bo.remoting.transport.netty.NettyHandler:82  -|  [DUBBO] The connection between /10.1.0.250:33222 and /10.1.0.250:36882 is established, dubbo version: 3.3.4-SNAPSHOT, current host: 10.1.0.250
12:21:36.655 |-INFO  [New I/O client worker #1-2] bo.remoting.transport.netty.NettyHandler:82  -|  [DUBBO] The connection between /10.1.0.250:36882 and /10.1.0.250:33222 is established, dubbo version: 3.3.4-SNAPSHOT, current host: 10.1.0.250
.... .... <=== Netty server encountered error,  the exception was caught by NettyHandler but wasn't logged.
12:21:36.655 |-INFO  [New I/O server worker #3-5] bo.remoting.transport.netty.NettyHandler:99  -|  [DUBBO] The connection between /10.1.0.250:33222 and /10.1.0.250:36882 is disconnected, dubbo version: 3.3.4-SNAPSHOT, current host: 10.1.0.250

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.85106% with 9 lines in your changes missing coverage. Please review.

Project coverage is 60.78%. Comparing base (e2c0411) to head (29810e9).
Report is 52 commits behind head on 3.3.

Files with missing lines	Patch %	Lines
...e/dubbo/remoting/transport/netty/NettyHandler.java	88.00%	1 Missing and 2 partials ⚠️
.../remoting/transport/netty4/NettyClientHandler.java	70.00%	1 Missing and 2 partials ⚠️
.../remoting/transport/netty4/NettyServerHandler.java	75.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15272      +/-   ##
============================================
+ Coverage     60.76%   60.78%   +0.01%     
- Complexity    10894    10898       +4     
============================================
  Files          1885     1885              
  Lines         86087    86112      +25     
  Branches      12896    12902       +6     
============================================
+ Hits          52314    52345      +31     
+ Misses        28323    28313      -10     
- Partials       5450     5454       +4     

Flag	Coverage Δ
integration-tests	33.22% <10.63%> (+0.08%)	⬆️
samples-tests	29.20% <8.51%> (-0.03%)	⬇️
unit-tests	58.91% <80.85%> (+<0.01%)	⬆️

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