Some callouts inherit from parent callout icon

Bug description

Callouts' icon gets inherited following this rule:

• html: Important > Caution > Warning > Tip > Note
• revealjs: Caution > Tip > Warning > Important > Note

It's worst for revealjs than html where top banner can also inherit the colour of the parent.

• typst and latex are fine.

• docx does not support nested callouts. (stack trace not pretty but informative)

  Stack trace

  FATAL (/Users/mcanouil/Projects/quarto/quarto-cli/src/resources/filters/./quarto-post/docx.lua:95) An error occurred:
  Found a nested callout in the document. Please fix this issue and try again.
  Error running filter /Users/mcanouil/Projects/quarto/quarto-cli/src/resources/filters/main.lua:
  ...quarto/quarto-cli/src/resources/filters/./common/log.lua:30: attempt to call a nil value (global 'crash_with_stack_trace')
  stack traceback:
          ...arto/quarto-cli/src/resources/filters/./common/error.lua:14: in function 'fail'
          .../quarto-cli/src/resources/filters/./quarto-post/docx.lua:95: in function <.../quarto-cli/src/resources/filters/./quarto-post/docx.lua:7>
          (...tail calls...)
          ...quarto/quarto-cli/src/resources/filters/./ast/render.lua:46: in local 'filter_fn'
          ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:154: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:144>
          (...tail calls...)
          [C]: in ?
          [C]: in method 'walk'
          ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:76: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:65>
          (...tail calls...)
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:82: in local 'callback'
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:100: in upvalue 'run_emulated_filter_chain'
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:136: in function <.../quarto-cli/src/resources/filters/./ast/runemulation.lua:133>
  stack traceback:
          ...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:76: in function <...o/quarto-cli/src/resources/filters/./ast/customnodes.lua:65>
          (...tail calls...)
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:82: in local 'callback'
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:100: in upvalue 'run_emulated_filter_chain'
          .../quarto-cli/src/resources/filters/./ast/runemulation.lua:136: in function <.../quarto-cli/src/resources/filters/./ast/runemulation.lua:133>
  ERROR: Error
      at renderFiles (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/render-files.ts:350:23)
      at eventLoopTick (ext:core/01_core.js:175:7)
      at async render (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/render-shared.ts:102:18)
      at async renderForPreview (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:428:24)
      at async render (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:172:22)
      at async preview (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/preview.ts:189:18)
      at async Command.actionHandler (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/preview/cmd.ts:424:7)
      at async Command.execute (https://deno.land/x/cliffy@v1.0.0-rc.3/command/command.ts:1948:7)
      at async Command.parseCommand (https://deno.land/x/cliffy@v1.0.0-rc.3/command/command.ts:1780:14)
      at async quarto (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/quarto.ts:156:5)
  

• pptx does not support callouts.

Same result for: 1.6, 1.5, and 1.4

Screenshots

html	revealjs

Steps to reproduce

---
title: "Callouts"
format:
  html: default
  revealjs: default
---

## Important

:::: {.callout-important}

::: {.callout-tip}
- HTML: Yes
- Reveal.js: No
:::

::: {.callout-note}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-warning}
- HTML: Yes
- Reveal.js: No
:::

::: {.callout-caution}
- HTML: Yes
- Reveal.js: No
:::
::::

## Caution

:::: {.callout-caution}
::: {.callout-tip}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-note}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-warning}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-important}
- HTML: No
- Reveal.js: Yes + banner colour
:::
::::

## Warning

:::: {.callout-warning}

::: {.callout-tip}
- HTML: Yes
- Reveal.js: No
:::

::: {.callout-note}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-important}
- HTML: No
- Reveal.js: Yes + banner colour
:::

::: {.callout-caution}
- HTML: No
- Reveal.js: No
:::
::::

## Tip

:::: {.callout-tip}
::: {.callout-note}
- HTML: Yes
- Reveal.js: Yes + banner colour
:::

::: {.callout-important}
- HTML: No
- Reveal.js: Yes + banner colour
:::

::: {.callout-warning}
- HTML: No
- Reveal.js: Yes + banner colour
:::

::: {.callout-caution}
- HTML: No
- Reveal.js: No
:::
::::

## Note

:::: {.callout-note}
::: {.callout-important}
- HTML: No
- Reveal.js: No
:::

::: {.callout-tip}
- HTML: No
- Reveal.js: No
:::

::: {.callout-warning}
- HTML: No
- Reveal.js: No
:::

::: {.callout-caution}
- HTML: No
- Reveal.js: No
:::
::::

Expected behaviour

Parent callout should not matter.

Actual behaviour

Parent matters.

Quarto check output

• Version: 99.9.9
• commit: 9d866bd7b142f004a3a32d3b71e1a4da8c9b97af

Quarto 99.9.9
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 99.9.9
      commit: 9d866bd7b142f004a3a32d3b71e1a4da8c9b97af
      Path: /Users/mcanouil/Projects/quarto/quarto-cli/package/dist/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.07.03
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/mcanouil/Library/TinyTeX/bin/universal-darwin
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.13.0
      Path: /Users/mcanouil/Projects/quarto/quarto-playground/.venv/bin/python3
      Jupyter: 5.7.2
      Kernels: julia-1.10, python3

[✓] Checking Jupyter engine render....OK

(/) Checking R installation...........ℹ R version 4.4.1 (2024-06-14)
! Config '~/.Rprofile' was loaded!
[✓] Checking R installation...........OK
      Version: 4.4.1
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Users/mcanouil/Projects/quarto/quarto-playground/renv/library/macos/R-4.4/aarch64-apple-darwin20
        - /Users/mcanouil/Library/Caches/org.R-project.R/R/renv/sandbox/macos/R-4.4/aarch64-apple-darwin20/f7156815
      knitr: 1.48
      rmarkdown: 2.27

[✓] Checking Knitr engine render......OK

The issue names no implementation file or regression test. Start by rendering the supplied QMD reproducer in html and revealjs, then trace the callout rendering entry points and add coverage for nested callouts. Done means each child keeps its own icon and revealjs banner color regardless of the parent callout.