Disables emoji in our Windows tests until Node is fixed (#5763)

**What's the problem this PR addresses?**

Node.js 20.4 broke using emojis in file names:
nodejs/node#48673

**How did you fix it?**

Disabling the code that relies on it (it's just a sanity check anyway).

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

@@ -1455,7 +1455,11 @@ describe(`Shell`, () => {
             await xfs.writeFilePromise(ppath.join(tmpDir, `BAR.txt`), ``);
             await xfs.writeFilePromise(ppath.join(tmpDir, `hello_world123.txt`), ``);
             await xfs.writeFilePromise(ppath.join(tmpDir, `&434)hello.txt`), ``);
-            await xfs.writeFilePromise(ppath.join(tmpDir, `😀.txt`), ``);
+
+            // TODO: Remove the condition once Node is fixed:
+            // https://github.com/nodejs/node/issues/48673
+            if (process.platform !== `win32`)
+              await xfs.writeFilePromise(ppath.join(tmpDir, `😀.txt`), ``);
 
             await expectResult(bufferResult(
               `echo +([[:alnum:]]).txt`,