[3.0] destroy executor and improve tests 0926

[kylixs]

What is the purpose of the change

• Destroy executor services
• dubbo-config-spring surefire plugin reuseForks=true
• Fix unregister DubboShutdownHook error
• Fix DecodeableRpcResult read config NPE
• Improve registry center of tests: PropertySourcesInJavaConfigTest, JavaConfigReferenceBeanTest

[codecov-commenter]

Codecov Report

Merging #8928 (d9489c0) into 3.0 (bba0a76) will increase coverage by 0.04%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##                3.0    #8928      +/-   ##
============================================
+ Coverage     63.43%   63.48%   +0.04%     
  Complexity      315      315              
============================================
  Files          1180     1180              
  Lines         50062    50091      +29     
  Branches       7502     7506       +4     
============================================
+ Hits          31757    31799      +42     
+ Misses        14843    14831      -12     
+ Partials       3462     3461       -1     

Impacted Files	Coverage Δ
...ava/org/apache/dubbo/config/DubboShutdownHook.java	60.60% <16.66%> (-20.88%)	⬇️
...java/org/apache/dubbo/rpc/cluster/RouterChain.java	78.72% <50.00%> (-0.54%)	⬇️
.../dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java	51.89% <50.00%> (+0.61%)	⬆️
.../threadpool/manager/DefaultExecutorRepository.java	73.91% <66.66%> (-0.51%)	⬇️
...apache/dubbo/rpc/protocol/injvm/InjvmProtocol.java	77.77% <0.00%> (-5.56%)	⬇️
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	69.15% <0.00%> (-2.81%)	⬇️
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	55.91% <0.00%> (-2.33%)	⬇️
...pache/dubbo/remoting/transport/AbstractClient.java	63.57% <0.00%> (-2.15%)	⬇️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	⬇️
... and 16 more

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[DiegoKrupitza]

The rest LGTM