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]

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci/build	fd870d5	link	true	/test build

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[lhy1024]

conflict so much and this PR is not necessary for pick