filters and shortcodes do not respect Quarto's convention about leading / #12408
Description
filters and shortcodes path resolution does not respect Quarto's convention about leading /.
mkdir issue
cd issue
touch -f _quarto.yml
echo 'function Pandoc(doc)\n quarto.log.output("Hello, world!")\nend' > filter.lua
mkdir subdir
echo '---\ntitle: "Hello"\nformat: html\nfilters:\n - at: post-quarto\n path: /filter.lua\n---\n\n# Hello, world!' > subdir/hello.qmd
quarto render subdir/hello.qmd
echo '---\ntitle: "Hello"\nformat: html\nfilters:\n - /filter.lua\n---\n\n# Hello, world!' > subdir/hello.qmd
quarto render subdir/hello.qmd
echo '---\ntitle: "Hello"\nformat: html\nshortcodes:\n - /filter.lua\n---\n\n# Hello, world!' > subdir/hello.qmd
quarto render subdir/hello.qmdERROR (/Users/mcanouil/Projects/quarto/quarto-cli/src/resources/filters/./common/wrapped-filter.lua:200) cannot open /filter.lua: No such file or directory
ERROR: Error
at renderFiles (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/render-files.ts:351:23)
at eventLoopTick (ext:core/01_core.js:175:7)
at async renderProject (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/project.ts:463:23)
at async Command.actionHandler (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/command/render/cmd.ts:251:26)
at async Command.execute (https://deno.land/x/[email protected]/command/command.ts:1948:7)
at async Command.parseCommand (https://deno.land/x/[email protected]/command/command.ts:1780:14)
at async quarto (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/quarto.ts:191:5)
at async file:///Users/mcanouil/Projects/quarto/quarto-cli/src/quarto.ts:220:5
at async file:///Users/mcanouil/Projects/quarto/quarto-cli/src/core/main.ts:41:14
at async mainRunner (file:///Users/mcanouil/Projects/quarto/quarto-cli/src/core/main.ts:43:5)