'nomad volume status' mount_options redaction is confusing

[tgross]

The mount_options field for a CSI volume can contain sensitive data, so we redact it in all our logs and API response. But the nomad volume status command shows a Mount Options = <none> field because we null-out the field when we convert from nomad/structs to api/structs (ref csi_endpoint.go#L110-L113). We should instead either send the [REDACTED] message over the wire when the value is non-nil (preferred) or remove the field from the command output entirely.

Note for reviewers: this may get tossed if I manage to get to #10470 but that's not on my "immediate todo" list.

[github-actions]

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