[3.4] fix(defrag): close temp file in case of error

[ghouscht]

See #18841 for details. Backport of #18851 to 3.4

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

[k8s-ci-robot]

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[ghouscht]

/assign @ahrtr

Should I prepare a changelog entry as well?

[ahrtr]

/ok-to-test

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