[I] Unify MIT partial merging strategy with other partial update modes [hudi]

["linliu-code (via GitHub)" <gi...@apache.org>]

linliu-code opened a new issue, #13949:
URL: https://github.com/apache/hudi/issues/13949

   ### Task Description
   
   **What needs to be done:**
   
   This is a followup ticket. That we want to unify partial merging for MIT and other partial update modes, like ignore_default.
   
   **Why this task is needed:**
   Improve code readability, easier for maintenance. 
   
   
   ### Task Type
   
   Code improvement/refactoring
   
   ### Related Issues
   
   **Parent feature issue:** (if applicable )
   https://issues.apache.org/jira/browse/HUDI-8401
   **Related issues:**
   NOTE: Use `Relationships` button to add parent/blocking issues after issue is created.
   
   


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