server: clean some repeat code by use 1<<20 or 1<<30

[bufferflies]

What problem does this PR solve?

Issue Number: Close #5307

unit.KB= 1000
unitKiB= 1024

What is changed and how does it work?

Check List

Tests

Code changes

Side effects

Related changes

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[codecov]

Codecov Report

Merging #5308 (349f812) into master (05444e2) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5308      +/-   ##
==========================================
+ Coverage   75.72%   75.87%   +0.14%     
==========================================
  Files         312      312              
  Lines       30962    30962              
==========================================
+ Hits        23447    23493      +46     
+ Misses       5511     5475      -36     
+ Partials     2004     1994      -10     

Flag	Coverage Δ
unittests	75.87% <100.00%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
pkg/mock/mockcluster/mockcluster.go	94.07% <100.00%> (ø)
server/core/region.go	91.27% <100.00%> (ø)
server/core/store.go	82.43% <100.00%> (ø)
server/core/test_util.go	83.20% <100.00%> (ø)
server/schedule/range_cluster.go	83.33% <100.00%> (ø)
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
pkg/dashboard/adapter/manager.go	79.31% <0.00%> (-6.90%)	⬇️
server/config/persist_options.go	93.37% <0.00%> (-0.70%)	⬇️
server/server.go	74.76% <0.00%> (-0.41%)	⬇️
... and 18 more

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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: b450094

[ti-chi-bot]

@bufferflies: Your PR was out of date, I have automatically updated it for you.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

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.