SAML2 Assertion Encryption

### Environment

self-hosted (https://develop.sentry.dev/self-hosted/)

### What are you trying to accomplish?

I'm configuring SSO via a generic SAML provider. All works well, but our company requires SAML Assertion Encryption which I'm struggling to setup. I would like to setup an x509 certificate for this purpose.

### How are you getting stuck?

So far that I can tell, there doesn't appear to be a way to configure a x509 certificate for this purpose. Either I'm not reading into the documentation correctly, or alternatively it is not supported by Sentry's SAML config. Any idea which it could be? If it's possible, would I be able to get some guidance on how?

### Where in the product are you?

Settings - Auth

### Link

_No response_

### DSN

_No response_

### Version

24.7.1