[release-3.5] 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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[kubernetes-prow]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[kubernetes-prow]

@k8s-infra-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-verify	72cc5ee	link	true	/test pull-etcd-verify
pull-etcd-unit-test-386	72cc5ee	link	true	/test pull-etcd-unit-test-386
pull-etcd-unit-test-arm64	72cc5ee	link	true	/test pull-etcd-unit-test-arm64
pull-etcd-unit-test-amd64	72cc5ee	link	true	/test pull-etcd-unit-test-amd64
pull-etcd-smoke-4-cpu-arm64	72cc5ee	link	true	/test pull-etcd-smoke-4-cpu-arm64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[ahrtr]

superseded by #22167