SpringBoot Revert support for allowing JoranConfigurators to be passed ahead of time to Logback

PR #33643 added JoranConfigurator support to LogbackLoggingSystem. It's currently a member variable set when processAheadOfTime is called. I wonder if there's a way of doing the same thing without relying on the method call side-effect.

Comment From: libetl

Hello, Happy to have this discussion with a core member of Spring. do you mean passing JoranConfigurators as a LogbackLoggingSystem constructor parameter ?