[ISSUE #4726] Return error when unregisterBroker is failed

[Oliverwqcwrw]

Make sure set the target branch to develop

What is the purpose of the change

Close #4726

Brief changelog

XX

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #4727 (51b8cc4) into develop (67b49b5) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             develop    #4727   +/-   ##
==========================================
  Coverage      44.81%   44.82%           
+ Complexity      7560     7556    -4     
==========================================
  Files            977      977           
  Lines          67640    67643    +3     
  Branches        8934     8934           
==========================================
+ Hits           30315    30319    +4     
- Misses         33580    33586    +6     
+ Partials        3745     3738    -7     

Impacted Files	Coverage Δ
...org/apache/rocketmq/broker/out/BrokerOuterAPI.java	19.21% <0.00%> (-0.05%)	⬇️
...tmq/namesrv/processor/DefaultRequestProcessor.java	61.79% <0.00%> (-0.53%)	⬇️
...e/rocketmq/namesrv/routeinfo/RouteInfoManager.java	65.94% <ø> (-0.06%)	⬇️
...ava/org/apache/rocketmq/filter/util/BitsArray.java	59.82% <0.00%> (-2.57%)	⬇️
...lient/impl/consumer/DefaultMQPushConsumerImpl.java	33.20% <0.00%> (-2.21%)	⬇️
...ache/rocketmq/broker/client/ConsumerGroupInfo.java	68.46% <0.00%> (-0.91%)	⬇️
...client/consumer/store/RemoteBrokerOffsetStore.java	68.14% <0.00%> (-0.89%)	⬇️
.../org/apache/rocketmq/proxy/config/ProxyConfig.java	48.08% <0.00%> (-0.55%)	⬇️
...rocketmq/broker/processor/PopMessageProcessor.java	38.19% <0.00%> (-0.55%)	⬇️
.../org/apache/rocketmq/store/ha/DefaultHAClient.java	61.02% <0.00%> (-0.52%)	⬇️
... and 18 more

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[coveralls]

Coverage decreased (-0.008%) to 49.066% when pulling 51b8cc4 on Oliverwqcwrw:develop-unregisterbroker-optimization-41 into 67b49b5 on apache:develop.

[HScarb]

Could you squash all commits into one commit?

[Oliverwqcwrw]

Could you squash all commits into one commit?

Hello, @HScarb
Thanks for your suggestion. I will squash it next time when I submit