Fix parser stringify subshell brackets (#6254)

## What's the problem this PR addresses?

With `@yarnpkg/parsers`, stringifying a subshell (e.g. `echo $(echo a)`)
uses the wrong brackets (e.g. `echo ${echo a}`)

## How did you fix it?

Change to use the correct brackets.

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.yarn/versions/d497ae00.yml

@@ -0,0 +1,26 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/parsers": patch
+  "@yarnpkg/shell": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/sdks"

packages/yarnpkg-parsers/sources/shell.ts

@@ -138,7 +138,7 @@ export function stringifyArgumentSegment(argumentSegment: ArgumentSegment): stri
       return argumentSegment.pattern;
 
     case `shell`:
-      return doubleQuoteIfRequested(`\${${stringifyShellLine(argumentSegment.shell)}}`, argumentSegment.quoted);
+      return doubleQuoteIfRequested(`$(${stringifyShellLine(argumentSegment.shell)})`, argumentSegment.quoted);
 
     case `variable`:
       return doubleQuoteIfRequested(

packages/yarnpkg-parsers/tests/shell.test.ts

@@ -186,6 +186,7 @@ const STRINGIFIER_TESTS: Array<[string, string]> = [
   [`echo foo > bar`, `echo foo > bar`],
   [`echo a$B"c"'d'`, `echo a\${B}cd`],
   [`echo a$B"c"'d'`, `echo a\${B}cd`],
+  [`echo $(echo a)`, `echo $(echo a)`],
   [`echo $(( 1 + 2 * 3 - 4 / 5 ))`, `echo $(( ( 1 + ( 2 * 3 ) ) - ( 4 / 5 ) ))`],
   [`echo $(( 7 - 2 - 3 * 5 / 6 ))`, `echo $(( ( 7 - 2 ) - ( ( 3 * 5 ) / 6 ) ))`],
   [`(echo foo && echo bar)`, `(echo foo && echo bar)`],