Fix temporary folder cleanup on exit (#14188)

When using mkdtemp, the folder content cleanup must be done by the user.

The current call to `rmdir` fails in case additional files are generated
while editing the code. For example vim with undofile activated does
this.

Fixes  #14099

IPython/core/interactiveshell.py

@@ -21,6 +21,7 b' import inspect'
 import os
 import re
 import runpy
+import shutil
 import subprocess
 import sys
 import tempfile
@@ -3902,7 +3903,7 b' class InteractiveShell(SingletonConfigurable):'
         del self.tempfiles
         for tdir in self.tempdirs:
             try:
-                tdir.rmdir()
+                shutil.rmtree(tdir)
                 self.tempdirs.remove(tdir)
             except FileNotFoundError:
                 pass