pkg/schedule: put merge operators together (#8050)

[ti-chi-bot]

This is an automated cherry-pick of #8050

What problem does this PR solve?

Issue Number: Ref #7897, close #8049.

What is changed and how does it work?

pkg/schedule: put merge operators together to maintain atomicity

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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: 5d6ab2e