[release-3.7] 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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[ahrtr]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.84%. Comparing base (7a4b47b) to head (5cdad10).
⚠️ Report is 15 commits behind head on release-3.7.

Additional details and impacted files

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

... and 18 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.7   #22139      +/-   ##
===============================================
+ Coverage        69.67%   69.84%   +0.16%     
===============================================
  Files              449      449              
  Lines            38186    38221      +35     
===============================================
+ Hits             26606    26694      +88     
+ Misses           10148    10105      -43     
+ Partials          1432     1422      -10     

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[ahrtr]

/retest

[ahrtr]

/retest

[ahrtr]

cc @fuweid @ivanvc @serathius

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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