[JENKINS-39179] [JENKINS-36088] Always use NIO to create and detect symbolic...

[JENKINS-39179] [JENKINS-36088] Always use NIO to create and detect symbolic links and Windows junctions (#3133)

* Always use NIO to detect symlinks

* Make assertion failure message consistent

* Catch NoSuchFileException to keep tests passing

* Make method name more specific and simlify assumption

* Remove obsolete comment and reword the main comment in isSymlink

* Deprecate Kernel32Util#isJunctionOrSymlink

* Use assumptions for junction creation and add messages to assumptions

* Replace deprecated code with recommended alternative

* Add comment explaining call to DosFileAttributes#isOther

* Do not fall back to native code when creating symlinks

* Log FileSystemExceptions when creating symbolic links

* Catch InvalidPathException and rethrow as IOException

* Deprecate Kernel32Utils#createSymbolicLink and #getWin32FileAttributes

* Preserve original logging behavior on Windows and remove useless call to Util#displayIOException