fix: catch URI Malformed error

[shetzel]

What does this PR do?

Catches and logs attempts to decode a SourceMember key that is not decodable to prevent URIError: URI malformed during source tracking operations. Adds a unit test for it.

What issues does this PR fix or reference?

@W-14842075@

[cristiand391]

that try/catch should work to continue the execution.

question: in which scenarios can one get an invalid key here?

[shetzel]

question: in which scenarios can one get an invalid key here?

If you create a layout or profile in an org with a string that doesn't decode, then try to retrieve it with sf project retrieve start (using source tracking) this would happen. It might happen with sf project retrieve preview as well.