IBM / ubiquity / 1185

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Fix/Generic error for PV not found in DB (for plugin identification the PV existence) (#216)

* Refactor volumeNotFoundError in database to be standard error for StorageClient interface.

Move this error from scbe backend to be generic for ubiqutiy StorageClient interface,
So the plugins will be able to identify if the GetVolume interface fail to find the volume because an error or because it was not found in Ubiqutiy DB.
The first to use it in the plugin is the flex Unmount CLI to identify if PV exist in ubiquity before unmount start (for idempotent issue resolving)

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