fix: Enable to balance released standby channel

[XuanYang-cn]

See also: #32879

[mergify[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.08%. Comparing base (0e5765b) to head (87462bf). Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #32986      +/-   ##
==========================================
+ Coverage   82.05%   82.08%   +0.02%     
==========================================
  Files        1007     1007              
  Lines      127668   127669       +1     
==========================================
+ Hits       104757   104794      +37     
+ Misses      18929    18903      -26     
+ Partials     3982     3972      -10     

Files	Coverage Δ
internal/datacoord/channel_manager_v2.go	84.77% <100.00%> (+1.63%)	:arrow_up:
internal/datacoord/policy.go	89.96% <100.00%> (-0.69%)	:arrow_down:

... and 35 files with indirect coverage changes

[XuanYang-cn]

/run-cpu-e2e

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[XuanYang-cn]

/run-cpu-e2e

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