CAC user registration no longer works as of 23.0.7-bb.1
As of Big Bang `2.23.0`, which includes Keycloak release `23.0.7-bb.1`, user registration with a CAC no longer works.
The browser displays message "An internal server error has occurred."
Associated log from the keycloak pod:
```
2024-03-27 20:09:00,035 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-3) Uncaught server error: java.lang.IllegalArgumentException: issuerCertificate cannot be null
```
issue