Windows: can now remove bazel-* symlinks

This change updates WindowsFileSystem so it:
- retrieves the DosFileAttributes instead of the
  BasicFileAttributes, because the latter does not
  report junctions as directories
- uses just isJunction to decide if a file is a
  symlink, doesn't look at whether it's a
  directory (again because java.nio.File also
  incorrectly reports junctions as
  non-directories)

Fixes https://github.com/bazelbuild/bazel/issues/1850

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MOS_MIGRATED_REVID=138187220

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