Pipe: Changed the separator check semantic for pipes / pipe plugins (#17175)

* fix

* sep

Author: Caideyipi

integration-test/src/test/java/org/apache/iotdb/pipe/it/dual/treemodel/auto/basic/IoTDBPipeSyntaxIT.java

@@ -335,7 +335,7 @@ public void testInvalidParameter() throws Exception {
   public void testDirectoryErrors() throws SQLException {
     try (final Connection connection = senderEnv.getConnection();
         final Statement statement = connection.createStatement()) {
-      List<String> wrongDirs = Arrays.asList(".", "..", "./hackYou", ".\\hackYouTwice");
+      List<String> wrongDirs = Arrays.asList(".", "..", "/hackYou", "..\\hackYouTwice");
       if (SystemUtils.IS_OS_WINDOWS) {
         wrongDirs = new ArrayList<>(wrongDirs);
         wrongDirs.add("BombWindows/:*?");

iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/utils/FileUtils.java

@@ -571,7 +571,7 @@ private static String copyFileRenameWithMD5(final File sourceFile, final File ta
   }
 
   public static String getIllegalError4Directory(final String path) {
-    if (path.equals(".") || path.equals("..") || path.contains("./") || path.contains(".\\")) {
+    if (path.equals(".") || path.equals("..") || path.contains("/") || path.contains("\\")) {
       return ILLEGAL_PATH_MESSAGE;
     }
     if (!WindowsOSUtils.isLegalPathSegment4Windows(path)) {