fix: print error:
messages and their contents from cargo
#3336
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I noticed in #3298 that many users are running into opaque cargo issues because we're swallowing cargo's output in some scenarios.
Apparently most build errors aren't covered by any of the cargo metadata variants:
oli-obk/cargo_metadata#168
This implements some basic heuristics to discover when cargo is emitting TextLine messages that are actually errors and ensures those make it to the user.