[DUBBO-3242]: switch from CopyOnWriteArrayList to regular list in order to avoid potential UnsupportedOperationException

[beiwei30]

What is the purpose of the change

#3242: switch from CopyOnWriteArrayList to regular list in order to avoid potential UnsupportedOperationException

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #3978 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #3978      +/-   ##
============================================
- Coverage     63.87%   63.86%   -0.01%     
  Complexity      100      100              
============================================
  Files           722      722              
  Lines         31852    31852              
  Branches       5115     5115              
============================================
- Hits          20346    20343       -3     
- Misses         9165     9168       +3     
  Partials       2341     2341

Impacted Files	Coverage Δ	Complexity Δ
...java/org/apache/dubbo/rpc/cluster/RouterChain.java	96.87% <100%> (ø)	0 <0> (ø)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-8.7%)	0% <0%> (ø)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	67.21% <0%> (-3.28%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	73.46% <0%> (-2.05%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	78.54% <0%> (-1.54%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0%> (-0.95%)	0% <0%> (ø)
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	80.88% <0%> (+0.73%)	0% <0%> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	78.94% <0%> (+5.26%)	0% <0%> (ø)	⬇️
...apache/dubbo/common/config/ConfigurationUtils.java	72% <0%> (+8%)	0% <0%> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	82.05% <0%> (+17.94%)	0% <0%> (ø)	⬇️

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[chickenlj]

LGTM