enhance: legacy code clean up

[shaoting-huang]

issue: #33839

[mergify]

@shaoting-huang Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[mergify]

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

[mergify]

@shaoting-huang ut workflow job failed, comment rerun ut can trigger the job again.

[shaoting-huang]

/run-cpu-e2e

[shaoting-huang]

rerun ut

[github-actions]

Hello shaoting-huang, you are not in the organization, so you do not have the permission to rerun the workflow, please contact @milvus-io/milvus-maintainers for help.

[mergify]

@shaoting-huang ut workflow job failed, comment rerun ut can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.91%. Comparing base (b69e909) to head (aca856d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #33838      +/-   ##
==========================================
- Coverage   80.92%   80.91%   -0.01%     
==========================================
  Files        1058     1058              
  Lines      135395   135367      -28     
==========================================
- Hits       109562   109529      -33     
+ Misses      21656    21655       -1     
- Partials     4177     4183       +6     

Files	Coverage Δ
internal/storage/binlog_iterator.go	92.50% <ø> (ø)
internal/storage/data_codec.go	69.66% <ø> (ø)
internal/storage/utils.go	80.76% <ø> (-0.41%)	⬇️

... and 33 files with indirect coverage changes

[sunby]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, shaoting-huang

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