Move Bridge configuration preparation from the shell scripts to the operator

[scholzj]

Similarly to #10668 for Connect / MM2, we should also move the configuration of the Kafka Bridge to a config file generated fully by the operator Java code instead of doing it from environment variables in the Bridge startup scripts. This will make it easier to extend it and to unit test it. However, this would need cross-project coordination as the startup script is part of the Bridge project while the new config file would be generated by the CO code in this repository.

[ppatierno]

Of course it makes sense to me. I could try to find some time for it in the coming weeks (if not I will delegate ;-)).

[im-konge]

Triaged on 9.1.2025: This makes sense and should be implemented (as @ppatierno is already working on it).