[feature-wip](unique-key-merge-on-write) fix calculate delete bitmap when flush memtable

[liaoxin01]

Proposed changes

Issue Number: close #xxx

Problem summary

Multiple memtable should use the same version when calculate delete bitmap. Otherwise, updating the delete bitmap of the same segment with different versions will cause the delete bitmap on the segment to be overwritten.

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

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...

[zhannngchen]

LGTM

[github-actions]

PR approved by anyone and no changes requested.

[yiguolei]

LGTM