[Sync to prerelease] release notes - Escape shortcodes in changelog files

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Description

Sync of #1763 to prerelease.

Original PR

release notes - Escape shortcodes in changelog files

when importing them as render target in quarto-web

Also, fix the existing ones.

files <- list.files("docs/download/changelog", pattern = "_changelog.md", recursive = TRUE)
for (file in files) {
 xfun::gsub_file(file, pattern = "(?<!\\{)(\\{\\{<[^>]*>\\}\\})(?!\\})", replacement = "{\\1}", perl = TRUE)
}

This fixes quarto-dev/quarto-cli#13322

[cderv]

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