Revert "Fix listFiles() and listDirectory() to follow symbolic links (#6808)"

This reverts commit c8ff0ce.

Author: pditommaso

modules/nf-commons/src/main/nextflow/extension/FilesEx.groovy

@@ -22,7 +22,6 @@ import java.nio.ByteBuffer
 import java.nio.channels.SeekableByteChannel
 import java.nio.file.FileAlreadyExistsException
 import java.nio.file.FileSystemException
-import java.nio.file.FileVisitOption
 import java.nio.file.FileVisitResult
 import java.nio.file.Files
 import java.nio.file.LinkOption
@@ -659,9 +658,8 @@ class FilesEx {
             return null
 
         final result = []
-        final opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS)
 
-        Files.walkFileTree(self, opts, Integer.MAX_VALUE, new SimpleFileVisitor<Path>() {
+        Files.walkFileTree(self, new SimpleFileVisitor<Path>() {
 
             FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
                 if( filter == null || invokeFilter(filter, file, attrs) )

modules/nf-commons/src/test/nextflow/extension/FilesExTest.groovy

@@ -603,28 +603,6 @@ class FilesExTest extends Specification {
         sourceFolder.deleteDir()
     }
 
-    def 'should list files in symlinked directory' () {
-
-        given:
-        def folder = Files.createTempDirectory('test')
-        def realDir = folder.resolve('realDir')
-        Files.createDirectories(realDir)
-        realDir.resolve('file1.txt').text = 'Hello1'
-        realDir.resolve('file2.txt').text = 'Hello2'
-        def linkDir = folder.resolve('linkDir')
-        Files.createSymbolicLink(linkDir, realDir)
-
-        when:
-        def paths = linkDir.listFiles()
-
-        then:
-        paths.size() == 2
-        paths.collect { it.name }.sort() == ['file1.txt', 'file2.txt']
-
-        cleanup:
-        folder?.deleteDir()
-    }
-
 
     def testSetReadonly() {