pd-ctl: fix hot region show (#6650)

[ti-chi-bot]

This is an automated cherry-pick of #6650

What problem does this PR solve?

Issue Number: Close #6649

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  
  

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• bufferflies

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[codecov]

Codecov Report

Patch coverage: 93.75% and project coverage change: +0.09 🎉

Comparison is base (2949a53) 74.84% compared to head (1bb54c5) 74.94%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #6680      +/-   ##
===============================================
+ Coverage        74.84%   74.94%   +0.09%     
===============================================
  Files              408      407       -1     
  Lines            40745    40754       +9     
===============================================
+ Hits             30496    30542      +46     
+ Misses            7566     7536      -30     
+ Partials          2683     2676       -7     

Flag	Coverage Δ
unittests	74.94% <93.75%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
server/cluster/coordinator.go	73.77% <93.33%> (+0.44%)	⬆️
pkg/statistics/hot_peer_cache.go	95.00% <100.00%> (+0.71%)	⬆️

... and 28 files with indirect coverage changes

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[lhy1024]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 7c0cc21