Fix a potential race in creating the ouput folder during exit-transac…

…tion-mnemonic command

staking_deposit/cli/exit_transaction_keystore.py

@@ -114,6 +114,8 @@ def exit_transaction_keystore(
     )
 
     folder = os.path.join(output_folder, DEFAULT_EXIT_TRANSACTION_FOLDER_NAME)
+    if not os.path.exists(folder):
+        os.mkdir(folder)
 
     click.echo(load_text(['msg_exit_transaction_creation']))
     saved_folder = export_exit_transaction_json(folder=folder, signed_exit=signed_exit)

staking_deposit/cli/exit_transaction_mnemonic.py

@@ -129,6 +129,9 @@ def exit_transaction_mnemonic(
                 credentials.append(credential)
                 bar.update(1)
 
+    if not os.path.exists(folder):
+        os.mkdir(folder)
+
     transaction_filefolders = []
     with click.progressbar(length=num_keys, label=load_text(['msg_exit_transaction_creation']),
                            show_percent=False, show_pos=True) as bar:

staking_deposit/exit_transaction.py

@@ -48,9 +48,6 @@ def export_exit_transaction_json(folder: str, signed_exit: SignedVoluntaryExit)
     signed_exit_json.update({'message': message})
     signed_exit_json.update({'signature': '0x' + signed_exit.signature.hex()})  # type: ignore[attr-defined]
 
-    if not os.path.exists(folder):
-        os.mkdir(folder)
-
     filefolder = os.path.join(
         folder,
         'signed_exit_transaction-%s-%i.json' % (