Optimize the doUnsubscribe method to remove elements from related containers

[BurningCN]

Optimize the doUnsubscribe method to remove elements from related containers

[codecov-commenter]

Codecov Report

Merging #7804 (63c327d) into master (e845e16) will increase coverage by 0.15%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master    #7804      +/-   ##
============================================
+ Coverage     59.28%   59.43%   +0.15%     
- Complexity      529      556      +27     
============================================
  Files          1077     1086       +9     
  Lines         43565    43804     +239     
  Branches       6368     6393      +25     
============================================
+ Hits          25826    26036     +210     
- Misses        14879    14898      +19     
- Partials       2860     2870      +10     

Impacted Files	Coverage Δ	Complexity Δ
...a/org/apache/dubbo/registry/etcd/EtcdRegistry.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...he/dubbo/registry/zookeeper/ZookeeperRegistry.java	60.24% <66.66%> (-0.13%)	0.00 <0.00> (ø)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	52.45% <0.00%> (-18.04%)	0.00% <0.00%> (ø%)
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	61.53% <0.00%> (-8.03%)	0.00% <0.00%> (ø%)
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	49.45% <0.00%> (-4.40%)	0.00% <0.00%> (ø%)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0.00%> (-4.35%)	0.00% <0.00%> (ø%)
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	8.00% <0.00%> (-1.00%)
...ava/org/apache/dubbo/rpc/filter/GenericFilter.java	37.70% <0.00%> (-3.37%)	0.00% <0.00%> (ø%)
...ain/java/org/apache/dubbo/config/MethodConfig.java	95.65% <0.00%> (-3.09%)	0.00% <0.00%> (ø%)
...fig/configcenter/TreePathDynamicConfiguration.java	77.14% <0.00%> (-2.86%)	0.00% <0.00%> (ø%)
... and 66 more

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