core: batch get region size (#7252)

[ti-chi-bot]

This is an automated cherry-pick of #7252

What problem does this PR solve?

Issue Number: Close #7248.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• lhy1024

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[lhy1024]

lgtm, but need to fix conflict

[nolouch]

/merge

[ti-chi-bot]

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

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[ti-chi-bot]

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

Commit hash: 305b550

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (9a50848) 74.90% compared to head (305b550) 74.84%.
Report is 3 commits behind head on release-7.1.

Files	Patch %	Lines
pkg/core/store_option.go	41.17%	10 Missing ⚠️
pkg/schedule/checker/rule_checker.go	83.33%	1 Missing and 1 partial ⚠️
server/cluster/cluster.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #7331      +/-   ##
===============================================
- Coverage        74.90%   74.84%   -0.06%     
===============================================
  Files              409      409              
  Lines            41293    41332      +39     
===============================================
+ Hits             30929    30936       +7     
- Misses            7659     7684      +25     
- Partials          2705     2712       +7     

Flag	Coverage Δ
unittests	74.84% <72.91%> (-0.06%)	⬇️

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