Dynamically assign pipeline buffer size

[kumarlokesh]

Attempts to resolve issue #19635.

Dynamically set the configuration pipeline-buffer-size, instead of using
hard-coded value 64.
Fallback to default value of 64 if configuration isn't provided.

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

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @kumarlokesh. Thanks for your PR.

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