cluster: fix the bug that region statistics are not updated after flow-round-by-digit change (#4304)

[ti-chi-bot]

This is an automated cherry-pick of #4304

What problem does this PR solve?

fix #4295

What is changed and how it works?

A change in flowRoundDivisor also considers that the flow statistics have changed.

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

Fix the bug that region statistics are not updated after `flow-round-by-digit` change.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• JmPotato

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: 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: 5f0d781

[nolouch]

/run-unit-tests

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[nolouch]

/run-unit-tests

[codecov]

Codecov Report

Merging #4329 (2364e29) into release-5.1 (dcfbff7) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.1    #4329      +/-   ##
===============================================
- Coverage        75.35%   75.25%   -0.10%     
===============================================
  Files              245      245              
  Lines            24686    24688       +2     
===============================================
- Hits             18602    18579      -23     
- Misses            4473     4492      +19     
- Partials          1611     1617       +6     

Flag	Coverage Δ
unittests	75.25% <100.00%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/core/region.go	91.22% <100.00%> (+0.01%)	⬆️
server/core/region_option.go	84.26% <100.00%> (+0.17%)	⬆️
server/grpc_service.go	48.34% <100.00%> (ø)
server/tso/local_allocator.go	80.55% <0.00%> (-9.73%)	⬇️
pkg/dashboard/adapter/manager.go	82.97% <0.00%> (-7.45%)	⬇️
server/election/leadership.go	83.52% <0.00%> (-5.89%)	⬇️
server/region_syncer/server.go	83.08% <0.00%> (-5.89%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
server/schedulers/random_merge.go	60.65% <0.00%> (-3.28%)	⬇️
server/member/member.go	66.12% <0.00%> (-2.16%)	⬇️
... and 7 more

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