Code filename not correctly placed when used on computational chunk

[cderv]

Bug description

From https://github.com/quarto-ext/code-filename/issues/3 but extensions has been included inside core now.

---
title: Test
format: html
---

Non computation code filename

```{.r filename="file.R"}
1 + 1 
```

Inside code-fold

```{r filename="file.R"}
#| code-fold: true

1 + 1
```

Do we want to support filename on computational chunk ? (which does not follow the YAML in chunk syntax)

If not, we should deactivate.
If we do, we maybe to introduce as YAML option and/or put the filename inside the folding of source.

Related Discussion item: #2642

Checklist

• Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
• Please format your issue so it is easier for us to read the bug report.
• Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
• Please document the operating system you're running. If on Linux, please provide the specific distribution.

[jjallaire]

Deferring this until we have a better handle on order of AST transformations. I'm not 100% sure what the "correct" behavior is here (i.e. which should compose on the other, whether we should allow both, etc.).