tests/api: add wait leader for api

[HuSharp]

What problem does this PR solve?

Issue Number: Close #8513

What is changed and how does it work?

tests/api: add wait leader for api

Release note

None.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lhy1024

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-16 03:54:36.101314825 +0000 UTC m=+499360.804784468: ☑️ agreed by lhy1024.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.57%. Comparing base (1b8fc6a) to head (e4e3438).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8540      +/-   ##
==========================================
+ Coverage   77.54%   77.57%   +0.03%     
==========================================
  Files         474      474              
  Lines       61862    61862              
==========================================
+ Hits        47969    47991      +22     
+ Misses      10350    10344       -6     
+ Partials     3543     3527      -16     

Flag	Coverage Δ
unittests	77.57% <ø> (+0.03%)	⬆️

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