test: skip test-child-process-stdio-reuse-readable-stdio on Windows

It is flaky due to the same cause of test-child-process-pipe-dataflow
being flaky - cygwin quirks - so skip it on Windows too.

Drive-by: remove the skip mark of test-child-process-pipe-dataflow
in the status file and directly skip it in the test with a comment.

test/parallel/parallel.status

@@ -11,9 +11,6 @@ prefix parallel
 test-crypto-keygen: PASS,FLAKY
 # https://github.com/nodejs/node/issues/41201
 test-fs-rmdir-recursive: PASS, FLAKY
-# https://github.com/nodejs/node/issues/48300
-test-child-process-pipe-dataflow: SKIP
-test-child-process-stdio-reuse-readable-stdio: PASS, FLAKY
 
 # Windows on ARM
 [$system==win32 && $arch==arm64]

test/parallel/test-child-process-pipe-dataflow.js

@@ -1,5 +1,11 @@
 'use strict';
 const common = require('../common');
+
+if (common.isWindows) {
+  // https://github.com/nodejs/node/issues/48300
+  common.skip('Does not work with cygwin quirks on Windows');
+}
+
 const assert = require('assert');
 const fs = require('fs');
 const spawn = require('child_process').spawn;

test/parallel/test-child-process-stdio-reuse-readable-stdio.js

@@ -1,5 +1,11 @@
 'use strict';
 const common = require('../common');
+
+if (common.isWindows) {
+  // https://github.com/nodejs/node/issues/48300
+  common.skip('Does not work with cygwin quirks on Windows');
+}
+
 const assert = require('assert');
 const { spawn } = require('child_process');