congqixia bed7467f20
enhance: Remove commented code and fix naming issue (#28450)
This PR removes all the commented code and files from PR #28320

For naming issue:
- Renaming `MinCheckpoint` to `EarliestPosition`, see #28320 comment
- Renaming `writebuffer.Mananger` to `BufferMananger`, see #27874
comment

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
2023-11-16 00:22:20 +08:00
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