Keep empty files when bundling Quarto in our builds (#9820)

I _hope_ that this addresses problems that folks are experiencing like:

- #5553
- #9081
- quarto-dev/quarto-r#283

We originally thought what needed to happen was to bundle tinytex or
another PDF engine, but that may not be the source of the error folks
are experiencing. Instead, as @cderv explains, these empty but required
files are missing, leading to errors like:

> NotFound: The system cannot find the file specified. (os error 2):
lstat
'C:\Users\JonVanausdeln\AppData\Local\Programs\Positron\resources\app\quarto\share\formats\pdf\pandoc\before-bib.tex'

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#### New Features

- N/A

#### Bug Fixes

- Fixed Quarto bundling on Windows


### QA Notes

We need to get a Windows release build here, and then try to use
`quarto::quarto_render()` for a small example file to render to PDF,
something like this:

````
---
title: "Diamond sizes"
format: pdf
---

```{r}
#| label: setup
#| include: false

library(tidyverse)
library(diamonds)

smaller <- diamonds |>
  filter(carat <= 2.5)
```

We have data about `r nrow(diamonds)` diamonds. Only `r nrow(diamonds) - nrow(smaller)` are larger than 2.5 carats. The distribution of the remainder is shown below:

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

```{r}
#| label: plot-smaller-diamonds
#| echo: false

smaller |> 
  ggplot(aes(x = carat)) +
  geom_freqpoly(binwidth = 0.03)
```

````

After this change, you'll get an error about not having tinytex instead
of a missing `before-bib.tex`.

Author: juliasilge

build/lib/quarto.js

@@ -36,7 +36,7 @@ function getQuartoWindows(version: string): Stream {
 		verbose: true,
 		timeoutSeconds: 90,
 	})
-		.pipe(unzip());
+		.pipe(unzip({ keepEmpty: true }));
 }
 
 /**