MultiMessageHandler should increase exception handling to prevent data loss

[xiaoheng1]

What is the purpose of the change

MultiMessageHandler should increase exception handling to prevent data loss

see more detail from #7815

Brief changelog

Verifying this change

• 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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• 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, 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.
• Run mvn clean install -DskipTests=false & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
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[codecov-commenter]

Codecov Report

Merging #7816 (b214bee) into master (1a7ca1e) will decrease coverage by 0.10%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #7816      +/-   ##
============================================
- Coverage     59.47%   59.36%   -0.11%     
+ Complexity      556      555       -1     
============================================
  Files          1083     1086       +3     
  Lines         43755    43805      +50     
  Branches       6380     6391      +11     
============================================
- Hits          26022    26004      -18     
- Misses        14876    14920      +44     
- Partials       2857     2881      +24     

Impacted Files	Coverage Δ	Complexity Δ
.../dubbo/remoting/transport/MultiMessageHandler.java	80.00% <50.00%> (-20.00%)	0.00 <0.00> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	14.00% <0.00%> (-1.00%)
...ting/exchange/support/header/HeartbeatHandler.java	83.72% <0.00%> (-9.31%)	0.00% <0.00%> (ø%)
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	61.53% <0.00%> (-8.03%)	0.00% <0.00%> (ø%)
.../threadpool/manager/DefaultExecutorRepository.java	80.64% <0.00%> (-4.84%)	0.00% <0.00%> (ø%)
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	49.45% <0.00%> (-4.40%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/WrappedChannelHandler.java	58.69% <0.00%> (-4.35%)	0.00% <0.00%> (ø%)
...bo/registry/client/migration/MigrationInvoker.java	28.40% <0.00%> (-4.34%)	0.00% <0.00%> (ø%)
.../main/java/org/apache/dubbo/qos/server/Server.java	75.00% <0.00%> (-4.17%)	0.00% <0.00%> (ø%)
...e/dubbo/registry/integration/DynamicDirectory.java	74.25% <0.00%> (-3.97%)	0.00% <0.00%> (ø%)
... and 31 more

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