fix: Channel may be released after balance (#37862)

[weiliu1031]

issue: #37830
pr: #37862
casue dist handler doesn't set channel's version, so if channel checker try to dedup channel, it may release the new delegator after balance finished.

this PR fix the way to set proper version for channel.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.67%. Comparing base (fc96133) to head (d421c4f).
Report is 1 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #37940      +/-   ##
==========================================
+ Coverage   80.62%   83.67%   +3.05%     
==========================================
  Files        1069      801     -268     
  Lines      166979   140519   -26460     
==========================================
- Hits       134621   117579   -17042     
+ Misses      27946    18524    -9422     
- Partials     4412     4416       +4     

Files with missing lines	Coverage Δ
internal/querycoordv2/dist/dist_handler.go	96.01% <100.00%> (+0.07%)	⬆️

... and 300 files with indirect coverage changes

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