Instead of generating bad output, we should issue an error.

The real bug is here: #2266 . The fix for it is quite tricky, so we should at least disallow this broken usage for the moment.
cscheid
2022-09-14T15:22:49Z
cscheid
v1.2
closed
`output-file` shouldn't take paths
https://github.com/quarto-dev/quarto-cli/issues/2440