[enhancement](merge-on-write) change cu compaction correctness check to warning

[zhannngchen]

Proposed changes

Issue Number: close #xxx

Problem summary

for some online service, compaction keep failing may cause large mem consumption, and it's not easy to recover change the error to warning log, which is more friendly to online users.

Checklist(Required)

• [ ] Does it affect the original behavior
• [ ] Has unit tests been added
• [ ] Has document been added or modified
• [ ] Does it need to update dependencies
• [ ] Is this PR support rollback (If NO, please explain WHY)

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[zhannngchen]

dup with #17347