[CELEBORN-1467] celeborn.worker.storage.dirs should support soft link

### What changes were proposed in this pull request?
`celeborn.worker.storage.dirs` supports soft link

### Why are the changes needed?
NPE will be thrown when StorageManager.createWriter if `celeborn.worker.storage.dirs` contains soft link.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Existing uts.

Closes #2576 from leixm/CELEBORN-1467.

Authored-by: Xianming Lei <31424839+leixm@users.noreply.github.com>
Signed-off-by: mingji <fengmingxiao.fmx@alibaba-inc.com>

common/src/main/scala/org/apache/celeborn/common/meta/DeviceInfo.scala

@@ -288,7 +288,9 @@ object DeviceInfo {
           val deviceInfo = mountPointToDeviceInfo.get(mountPoint)
           val diskInfo = new DiskInfo(
             mountPoint,
-            dirs.map(_._1).toList,
+            dirs.map { workingDir =>
+              new File(workingDir._1.getCanonicalPath)
+            }.toList,
             deviceInfo,
             conf)
           val (_, maxUsableSpace, threadCount, storageType) = dirs(0)