[OSDOCS-12351]: Updating xrefs to etcd backup/restore content

[lahinson]

Version(s): 4.19

Issue: https://issues.redhat.com/browse/OSDOCS-12351

Link to docs preview:

• Control plane architecture: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/architecture/control-plane#etcd-architecture_control-plane
• Backup and restore section (the "Control plane backup and restore" subsection has been removed, and the content has been moved to the "Backing up and restoring etcd data" section): https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/
• Backing up and restoring etcd data: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/etcd/etcd-backup
• Intro to OADP: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/application_backup_and_restore/oadp-intro (see inline link to etcd and Additional resources)
• Restarting the cluster gracefully: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/graceful-cluster-restart (see links to "restore to a previous cluster state")
• Shutting down the cluster gracefully: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/graceful-cluster-shutdown (see inline links to etcd content)
• Hibernating a cluster: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/hibernating-cluster (see inline links to etcd content)
• Control plane backup and restore operations: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/#control-plane-backup-restore-operations-overview (see inline links and Additional resources)
• Creating a single automated etcd backup: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/edge_computing/day_2_core_cnf_clusters/updating/telco-update-before-the-update#creating-single-etcd-backup_telco-update-before-the-update (see additional resources)
• Moving the rollback stage of the image-based upgrade with Lifecycle Agent: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/edge_computing/image_based_upgrade/cnf-image-based-upgrade-base#cnf-image-based-upgrade-rollback_cnf-non-gitops (see additional resources)
• Rolling back an image-based upgrade on managed clusters at scale: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/edge_computing/image_based_upgrade/ztp-image-based-upgrade#ztp-image-based-upgrade-procedure-rollback_ztp-gitops (see additional resources)
• Replacing a bare-metal control plane node: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/bare-metal-expanding-the-cluster#replacing-a-bare-metal-control-plane-node_bare-metal-expanding (see additional resources)
• Creating the Kubernetes manifest and Ignition config files: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal#installation-user-infra-generate-k8s-manifest-ignition_installing-bare-metal (see additional resources)
• Creating the Kubernetes manifest and Ignition config files: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-restricted-networks-bare-metal#installation-user-infra-generate-k8s-manifest-ignition_installing-restricted-networks-bare-metal (see additional resources)
• Recovering a degraded etcd Operator: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/machine_management/control_plane_machine_management/cpmso-troubleshooting#cpmso-ts-etcd-degraded_cpmso-troubleshooting (see additional resources)
• Additional resources: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/machine_management/deleting-machine#additional-resources_unhealthy-etcd-member
• Rebooting a node gracefully: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/nodes/nodes/nodes-nodes-rebooting#nodes-nodes-rebooting-gracefully_nodes-nodes-rebooting (see additional resources)
• Changing the Amazon Web Services instance type by using the AWS console: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/recommended-performance-scale-practices/recommended-control-plane-practices#aws-console-changing-aws-instance-type_recommended-control-plane-practices (see additional resources)
• Node scaling for etcd: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/recommended-performance-scale-practices/recommended-etcd-practices#etcd-node-scaling_recommended-etcd-practices (see additional resources)
• Control plane certificates: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/security/certificate_types_descriptions/control-plane-certificates#management (see link in Management section)
• etcd certificates: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/security/certificate_types_descriptions/etcd-certificates (see additional resources)
• etcd backups before cluster updates: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/updating/preparing_for_updates/updating-cluster-prepare#update-etcd-backup_updating-cluster-prepare (see additional resources)
• Prerequisites to update the cluster using the CLI: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/updating/updating_a_cluster/updating-cluster-cli#prerequisites (see etcd backup inline link)
• Learn more about OCP: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/welcome/learn_more_about_openshift#architecture (see last row in Architecture section)
• Rebooting the node gracefully: https://93329--ocpdocs-pr.netlify.app/openshift-enterprise/latest/windows_containers/enabling-windows-container-workloads#nodes-nodes-rebooting-gracefully_enabling-windows-container-workloads (see additional resources)

QE review:

• QE has approved this change.

Additional information: This PR is part of the effort to consolidate all of the etcd content into one new book. This PR removes the etcd-related backup and restore content from the "Backup and restore" book and redirects links to their new locations.

Related PRs: #93059, #93389

[ocpdocs-previewbot]

🤖 Wed May 14 18:12:34 - Prow CI generated the docs preview:
https://93329--ocpdocs-pr.netlify.app
Complete list of updated preview URLs: artifacts/updated_preview_urls.txt

[bergerhoffer]

Sending a DM about removing this content from the backup and restore book.

[openshift-ci]

@lahinson: all tests passed!

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