fix: [2.4]channel manager's goroutine run order

[XuanYang-cn]

See also: #33117
pr: #33118

[mergify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.79%. Comparing base (2f260cd) to head (4158173).
Report is 2 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #33121      +/-   ##
==========================================
- Coverage   82.14%   81.79%   -0.35%     
==========================================
  Files        1005     1005              
  Lines      128037   128038       +1     
==========================================
- Hits       105170   104728     -442     
- Misses      18899    19322     +423     
- Partials     3968     3988      +20     

Files	Coverage Δ
internal/datanode/channel_manager.go	92.65% <100.00%> (-1.38%)	⬇️

... and 42 files with indirect coverage changes

[mergify]

@XuanYang-cn E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[XuanYang-cn]

/run-cpu-e2e

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@XuanYang-cn E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

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[congqixia]

/lgtm

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