Custom Cert Authentication not working with SWA deploy

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- [ ] No, I am using a different port number (`--port`) and accessing the CLI from that port
- [x] Yes, I am accessing the CLI from port `:4280`

> Make sure you are accessing the URL printed in the console when running `swa start`!

**ℹ️ NOTE: Make sure to enable debug logs when running any `swa` commands using `--verbose=silly`**

**Describe the bug**
On the Static Web App documentation there is a sample using cert-based authentication:


[Custom authentication in Azure Static Web Apps | Microsoft Learn](https://learn.microsoft.com/en-us/azure/static-web-apps/authentication-custom?tabs=aad%2Cinvitations)

It uses the clientSecretCertificateKeyVaultReference property. But when I run swa deploy I am getting errors saying that is invalid:


**To Reproduce**
Steps to reproduce the behavior:

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2. Type in command 'swa ...'
3. Click on '...'
4. Scroll down to '...'
5. See error

**Expected behavior**
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**Screenshots**
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**Desktop (please complete the following information):**

- OS: [e.g. iOS]
- Version [e.g. 22]

**Additional context**
Add any other context about the problem here.

まず、`swa --version` で CLI のバージョンを確認してから、`swa deploy` と `--verbose=silly` を使用して失敗を再現します。`clientSecretCertificateKeyVaultReference` の処理を、リンク先の Azure Static Web Apps ドキュメントと比較します。完了とは、ドキュメントに記載された証明書ベースの構成が、報告された無効なプロパティのエラーなしに受け入れられることを意味します。

索引モデルが issue の本文から書いたものです。