refactor: move cmd-shim into the pnpm monorepo (#14893)

Import cmd-shim source, tests, and snapshots from pnpm/cmd-shim at
83f9b9449c2adeec26e1cc2d03ef0fe82d2e41ca. Maintaining the shim alongside
its consumers removes the need for coordinated changes across repositories.

Publish the package as `@pnpm/bins.cmd-shim` and replace external dependencies
with workspace links. Preserve the original BSD-2-Clause license, including
its copyright notice, and keep the manifest updater from replacing it with MIT.
Reuse `@pnpm/fs.graceful-fs` and integrate the existing Node.js tests with the
workspace test scripts. Retain the existing snapshots and align the version
with the TypeScript workspace's required 1100.x band.

.github/scripts/run-ts-tests-chunk.mjs

@@ -178,10 +178,13 @@ async function runScriptTask (pkg) {
   try {
     if (pkg.manifest.name === 'pd') {
       await runCommand('node', ['pd.js', '--version'], { cwd: pkg.path })
+    } else if (pkg.manifest.name === '@pnpm/bins.cmd-shim') {
+      await runCommand('node', ['--test', 'test/test.js', 'test/e2e.test.js'], { cwd: pkg.path })
     } else {
       throw new Error(`Unsupported non-Jest .test script in ${relDir}: ${pkg.manifest.scripts['.test']}`)
     }
   } catch (err) {
+    console.error(err)
     status = 'failure'
     exitCode = err.exitCode ?? 1
   }