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[bot]]

Codecov Report

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

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

[](https://app.codecov.io/gh/milvus-io/milvus/pull/37940?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) ```diff @@ 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](https://app.codecov.io/gh/milvus-io/milvus/pull/37940?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | Coverage Δ | | |---|---|---| | [internal/querycoordv2/dist/dist\_handler.go](https://app.codecov.io/gh/milvus-io/milvus/pull/37940?src=pr&el=tree&filepath=internal%2Fquerycoordv2%2Fdist%2Fdist_handler.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-aW50ZXJuYWwvcXVlcnljb29yZHYyL2Rpc3QvZGlzdF9oYW5kbGVyLmdv) | `96.01% <100.00%> (+0.07%)` | :arrow_up: | ... and [300 files with indirect coverage changes](https://app.codecov.io/gh/milvus-io/milvus/pull/37940/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io)

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