[MERGE][BUG #77657] Give a nicer error for non fs_enc() paths

[Aaron Bentley]

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John Arbash Meinel wrote:
> Bug #77657 is about our inability to add paths that cannot be decoded in
> the current FS encoding.
> 
> The attached patch just changes "iter_changes" to give a clear exception
> about what file is causing the problems (which also removes the ugly
> traceback.)

bb:comment

Couldn't this be applied to all working tree implementations?  That
would have a benefit for future formats.

Aaron
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