[UX] wrap user-facing `mfs.Lookup` error

[schomatis]

Checklist

• This is a bug report, not a question. Ask questions on discuss.ipfs.io.
• I have searched on the issue tracker for my bug.
• I am running the latest go-ipfs version or have an issue updating.

Installation method

ipfs-desktop

Version

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Config

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Description

To avoid the blank Error: file does not exist and specify which file we failed to find.

Will tackle after landing #8668 to avoid rebasing.