[3.5] Avoid deadlock in etcd.Close when stopping during bootstrapping

[joshuazh-x]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

#19150: Backport #19139 to 3.5

[k8s-ci-robot]

Hi @joshuazh-x. Thanks for your PR.

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[ivanvc]

/retitle [3.5] Avoid deadlock in etcd.Close when stopping during bootstrapping

[ivanvc]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, joshuazh-x, serathius

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