Azure static web apps support certificate instead of secret for custom AAD authentication.

**Is your feature request related to a problem? Please describe.**
Static web apps can be configured with custom authentication. But that requires creation of a secret on the Entra ID application. as described [here](https://learn.microsoft.com/en-us/azure/static-web-apps/authentication-custom?tabs=aad%2Cinvitations)

**Describe the solution you'd like**
Similar to key vault if we can use a certificate and the certificate can be directly requested form the key vault (similar to secret) then rotation becomes simpler.

**Describe alternatives you've considered**
No alternatives.

**Additional context**
For example we cannot use Azure Static web Apps as Microsoft 1st Party app because 1st party apps only support certificates but not secrets.