schedule: move schedule plan to the right place

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

The balance plan definition should be moved to the plan package.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• JmPotato

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[codecov]

Codecov Report

Merging #6769 (e0445f4) into master (fbedf3a) will decrease coverage by 0.05%.
The diff coverage is 87.69%.

❗ Current head e0445f4 differs from pull request most recent head 88462ff. Consider uploading reports for the commit 88462ff to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6769      +/-   ##
==========================================
- Coverage   74.17%   74.12%   -0.05%     
==========================================
  Files         411      411              
  Lines       43126    43126              
==========================================
- Hits        31988    31969      -19     
- Misses       8266     8279      +13     
- Partials     2872     2878       +6     

Flag	Coverage Δ
unittests	74.12% <87.69%> (-0.05%)	⬇️

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[JmPotato]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: e0445f4

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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