scheduler: use move-hot-write-leader operator (#7852)

[ti-chi-bot]

This is an automated cherry-pick of #7852

What problem does this PR solve?

Issue Number: Close #7848

What is changed and how does it work?

Check List

Tests

• Unit test
• manual test with 6 tikv
  • tpcc
    
  • oltp_read_write
    
  • oltp_write_only
    
  • oltp_update_index
    
  • oltp_update_non_index
    
  • oltp_insert
    

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d6e1963