api/middleware: avoid redirecting when the leader remains unchanged

[JmPotato]

What problem does this PR solve?

Issue Number: ref #7300.

What is changed and how does it work?

Avoid redirecting when the leader remains unchanged.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.41%. Comparing base (52389b0) to head (d027b92).
Report is 1 commits behind head on master.

❗ Current head d027b92 differs from pull request most recent head 64c441e

Please upload reports for the commit 64c441e to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8228      +/-   ##
==========================================
+ Coverage   77.26%   77.41%   +0.15%     
==========================================
  Files         470      470              
  Lines       61337    61340       +3     
==========================================
+ Hits        47390    47488      +98     
+ Misses      10377    10291      -86     
+ Partials     3570     3561       -9     

Flag	Coverage Δ
unittests	77.41% <100.00%> (+0.15%)	⬆️

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

[nolouch]

lgtm

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: 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: d027b92

[ti-chi-bot]

@JmPotato: Your PR was out of date, I have automatically updated it for you.

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