Add end user restore documentation

[dkwon17]

Assisted-by: gemini-2.5-pro

What does this pull request change?

Adds restore documentation for the dashboard.

The doc is available in the new Restoring a workspace from backup section in the end user guide.

What issues does this pull request fix or reference?

Documentation is for functionality added from these PRs:

• Backup/restore devworkspaces che-dashboard#1471
• Add resource limits to Restore from Backup che-dashboard#1478

Specify the version of the product this pull request applies to

DS 3.27

Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • Successfully tested.
• Any page or link rename:
  • The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • Dashboard default branding data
• Builds on Eclipse Che hosted by Red Hat.
• the Validate language on files added or modified step reports no vale warnings.

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[gtrivedi88]

Suggested change

	When backup is enabled for {devworkspace} instances on your cluster, workspace data can be captured when a workspace stops.
	When backups are enabled for {devworkspace} instances on your cluster, the system captures workspace data when a workspace stops. You can start a new workspace from an existing backup by using the {prod-short} dashboard.

[dkwon17]

Changed to:

When backups are enabled for {devworkspace} instances on your cluster, a cron job will backup workspace data for stopped workspaces.

[gtrivedi88]

Hi @dkwon17 We have a concept module and two procedures module in here. As a results, based on mod docs guide lines we need 3 files.

• con-workspace-backups.adoc[leveloffset=+1] - Please apply the suggestions and remove the procedures and if possible rename the file to reflect that it is a concept.
• proc-viewing-backups-in-the-dashboard.adoc[leveloffset=+1] - Provided end-to-end content for this in comments
• proc-restoring-a-workspace-from-backup.adoc[leveloffset=+1] - Provided end-to-end content for this in comments

Please let me know if you have questions.

[Allda]

External backups can also be defined by the cluster administrator if not using the built-in registry. This sentence is a bit confusing.

[dkwon17]

My latest change updates it to the following:

This is referring to the Default registry (ie, choosing from dropdown, it works for both internal openshift registry and other registries like quay.io) and External registry (manually input container image) section in the UI:

Basically, External registry in the UI is not referring registries that are not the internal openshift registry, it's referring to any registry not defined in the DevWorkspaceOperatorConfig .