longhorn-manager fix: do not silent the error returned by ReconcileBackupVolumeState

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Right now when there are multiple backup volumes of the same volume on the same backup target, we silently ignore the error, return nil, and abort the volume syncing: https://github.com/longhorn/longhorn-manager/blob/7b9d2aa08a572b2b8bce35b3ff0e90dfaa1b0eaf/controller/volume_controller.go#L530-L532

User would have no idea of why the volume is stuck.

longhorn/longhorn#11152

Jun 23 '25 19:06 PhanLe1010

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