Translate docs/tasks/administer-cluster/configure-upgrade-etcd.md into Japanese (#44374)

* init: cp content/en/docs/tasks/administer-cluster/configure-upgrade-etcd.md content/ja/docs/tasks/administer-cluster/configure-upgrade-etcd.md

* feat: translate ## Prerequisites

* feat: translate ## Resource requirements, ## Starting etcd clusters

* feat: translate ## Securing etcd clusters

* feat: translate ## Replacing a failed etcd member

* feat: translate ## Backing up an etcd cluster

* feat: translate ## Scaling out etcd clusters

* feat: translate ## Restoring an etcd cluster

* feat: translate ## Upgrading etcd clusters

* sed -i '' 's/クラスタ\([^ー]\)/クラスター\1/g' content/ja/docs/tasks/administer-cluster/configure-upgrade-etcd.md

* feat: translate title, overview

* update: self review and fix

* fix: nits fix related in ":"

* update: L24

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* del: unnecessary \n

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* update: L248

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Co-authored-by: inukai <82919057+t-inu@users.noreply.github.com>

Author: Okabe-Junya