[fix](merge-on-write) migration may cause duplicate keys for mow table (#28923)

[liaoxin01]

Proposed changes

cherry_pick from #28923

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[liaoxin01]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 37.75% (7992/21170)
Line Coverage: 29.45% (64922/220428)
Region Coverage: 28.92% (33397/115466)
Branch Coverage: 24.80% (17136/69104)
Coverage Report: http://coverage.selectdb-in.cc/coverage/676b68615a5ef95c8f9b9a05f873e95739f75e11_676b68615a5ef95c8f9b9a05f873e95739f75e11/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 46.59 seconds
stream load tsv: 566 seconds loaded 74807831229 Bytes, about 126 MB/s
stream load json: 19 seconds loaded 2358488459 Bytes, about 118 MB/s
stream load orc: 65 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 29.6 seconds inserted 10000000 Rows, about 337K ops/s
storage size: 17162174314 Bytes

[zhannngchen]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.