fix(backup): modify backup APIs for backup target and volume name (backport #3471)

[mergify]

Which issue(s) this PR fixes:

Issue # longhorn/longhorn#10182

What this PR does / why we need it:

Ensure backups have backup target name and volume name in the
returning information of API BackupList and BackupGet.
Backups in state pending, in-progress, and error
will not have the backup target name and volume name in b.Status.

Special notes for your reviewer:

Additional documentation or context

---

This is an automatic backport of pull request #3471 done by [Mergify](https://mergify.com).

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