[branch-2.1](move-memtable) fix move memtable core when use multi table load

[sollhui]

Proposed changes

pick #35458

[sollhui]

run buildall

[sollhui]

run buildall

[github-actions]

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

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.33% (9151/25189)
Line Coverage: 27.87% (74698/268002)
Region Coverage: 26.76% (38514/143912)
Branch Coverage: 23.45% (19514/83220)
Coverage Report: http://coverage.selectdb-in.cc/coverage/8378fce8bbe544a34025b661182effa7f2896d1e_8378fce8bbe544a34025b661182effa7f2896d1e/report/index.html

[sollhui]

run buildall

[github-actions]

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

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.33% (9150/25189)
Line Coverage: 27.87% (74695/268007)
Region Coverage: 26.76% (38515/143917)
Branch Coverage: 23.45% (19515/83226)
Coverage Report: http://coverage.selectdb-in.cc/coverage/0befea24160ab06cbd9a9be8c46afa75b5d73a64_0befea24160ab06cbd9a9be8c46afa75b5d73a64/report/index.html