Fix: cli: Break out of retrieval if provider cancels

[geoff-vball]

Related Issues

Proposed Changes

Miner can send a Cancelled message if they are unable to unseal data. There is currently no return value for this case, so the client will hang. Client will now exit if they receive a Cancelled message.

Additional Info

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[RobQuistNL]

How do I actually cancel a retrieval as a storage provider?

[geoff-vball]

@RobQuistNL I don't think we have any ways to cancel manually.

The one situation I was testing was if the SP agrees to the deal and has a sealed copy of the data, but is unable to unseal the data for some reason, the deal will automatically be cancelled.