[release-3.6] Fix the costTxnReq ignores nested RequestTxn issue

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #22134

/assign ahrtr

[kubernetes-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.27%. Comparing base (5f12ec3) to head (cca254a).
⚠️ Report is 15 commits behind head on release-3.6.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/quota.go	67.10% <100.00%> (+0.43%)	⬆️

... and 31 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #22140      +/-   ##
===============================================
+ Coverage        68.78%   69.27%   +0.49%     
===============================================
  Files              420      420              
  Lines            35890    36268     +378     
===============================================
+ Hits             24686    25125     +439     
+ Misses            9752     9696      -56     
+ Partials          1452     1447       -5     

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[ahrtr]

/retest

[ahrtr]

cc @fuweid @ivanvc @serathius

[ahrtr]

/test pull-etcd-coverage-report

[ahrtr]

/test pull-etcd-coverage-report

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid, k8s-infra-cherrypick-robot

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