password change for former SAML user not working

### problem

As an admin I'm able to reset password for a regular user without problems.
If SAML has been enabled for that user this is no longer possible within CloudStack. Expected behavior.
Once I disable SAML for that user I would expect that I'm able to change the password again. That is not the case and the error below will appear.

### versions

ACS 4.20.1

### The steps to reproduce the bug

1. run all steps as admin
2. create a user
3. reset the password for that user
4. enable SAML (needs to be configured before) for this user
5. try to reset the password (will fail)
6. disable SAML for this user
7. try to reset the password (should work?) will fail
...

### What to do about it?

Enable the possibility to change the password for a former SAML user.

CloudStack 4.20.1 で管理者のパスワードリセットフローを再現します。ユーザーを作成し、SAML を有効化し、無効化してから、リセットを再試行します。パスワード変更のエントリポイントとユーザーの SAML 状態を追跡します。SAML を無効化した後、管理者が報告されたエラーなしでパスワードをリセットできれば完了です。

索引モデルが issue の本文から書いたものです。