test: split test-fs-cp.js

This test previously squeezed 70+ test cases into one single file
and has been constantly crashing on Windows with exit code
3221226505 and no stack trace. As it is already marked as flaky
there is no way to understand which test case is failing and
the Windows CI was constantly orange. This patch splits the
test cases into different files so it's easier to find out
which case is exactly failing and to be skipped.

PR-URL: https://github.com/nodejs/node/pull/59408
Refs: https://github.com/nodejs/node/issues/56794
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Zeyu "Alex" Yang <himself65@outlook.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>

test/parallel/test-fs-cp-async-socket.mjs

@@ -0,0 +1,34 @@
+// This tests that cp() returns an error if attempt is made to copy socket.
+
+import * as common from '../common/index.mjs';
+import assert from 'node:assert';
+import { cp, mkdirSync } from 'node:fs';
+import { createServer } from 'node:net';
+import { join } from 'node:path';
+import { nextdir } from '../common/fs.js';
+import tmpdir from '../common/tmpdir.js';
+
+const isWindows = process.platform === 'win32';
+if (isWindows) {
+  common.skip('No socket support on Windows');
+}
+
+// See https://github.com/nodejs/node/pull/48409
+if (common.isInsideDirWithUnusualChars) {
+  common.skip('Test is borken in directories with unusual characters');
+}
+
+tmpdir.refresh();
+
+{
+  const src = nextdir();
+  mkdirSync(src);
+  const dest = nextdir();
+  const sock = join(src, `${process.pid}.sock`);
+  const server = createServer();
+  server.listen(sock);
+  cp(sock, dest, common.mustCall((err) => {
+    assert.strictEqual(err.code, 'ERR_FS_CP_SOCKET');
+    server.close();
+  }));
+}