[fix](rpc) The proxy removed when rpc exception occurs is not an abnormal proxy(#13836)

[zenoyang]

Proposed changes

Issue Number: close #xxx
BackendServiceProxy.getInstance() uses the round robin strategy to obtain the proxy,
so when the current RPC request is abnormal, the proxy removed by
BackendServiceProxy.getInstance().removeProxy(...) is not an abnormal proxy.

cherry pick:#13836

Problem summary

Describe your changes.

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[yiguolei]

LGTM