eval: false on mermaid not applying when publishing to confluence

Related to

• #9407

Taking this doc

---
format: confluence-html
title: test diagrame
embed-resources: false
author: Me
engine: knitr
execute:
   echo: true
   eval: false
---

This is a diagram

```{mermaid}
%%| echo: true
%%| eval: false
flowchart LR
  A[Hard edge] --> B(Round edge)
  B --> C{Decision}
  C --> D[Result one]
  C --> E[Result two]
```

and doing quarto publish confluence index.qmd, a png file for the mermaid cell will still be done.

index_files/figure-publish/
└── mermaid-figure-1.png

I believe this should not happen

Reproduce the issue with the provided document and quarto publish confluence index.qmd; inspect the generated index_files/figure-publish/ directory and the Mermaid cell's handling of eval: false. Done means publishing no longer creates mermaid-figure-1.png when evaluation is disabled.