fix(plan): stdout logic for valid output files #1249
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Don't let build plans generate anything invalid files. If an error or warning should be generated, it should be outputted to stderr. That way, consumers can be pretty confident that the output is only ever in valid TOML/JSON format.
This closes #1241 and is a slightly more complete solution over #1242.
Considerations were made to have a "verbose mode" however, doing that would require significant refactoring, all for only 3 or 4 impacted providers. Instead, recoverable errors should be directed to stderr using
eprintln!