Everest queue option `server` not working with LSF

What happened? (You can include a screenshot if it helps explain)

The simulator.server option does not get mapped to a correct ErtConfig entry. It will only error if accompanied by queue_system: lsf

What did you expect to happen?

For it to get to the point of trying to submit the forward models to the queue, and failing if it does not exist.

steps to reproduce

How to recreate: Edit test-data/everest/math_func/config_multiobj.yml to have this simulator section:

simulator:
  queue_system: lsf
  cores: 3
  name: mr
  resubmit_limit: 17
  options: span = 1 && select[x86 and GNU/Linux]
  server: lx-fastserver01

Then run the test, see this:

        if errors:
>           raise ConfigValidationError.from_collected(errors)
E           ert.config.parsing.config_errors.ConfigValidationError: Invalid QUEUE_OPTION for LSF: 'LSF_SERVER'. Valid choices are ['BHIST_CMD', 'BJOBS_CMD', 'BKILL_CMD', 'BSUB_CMD', 'EXCLUDE_HOST', 'LSF_QUEUE', 'LSF_RESOURCE', 'MAX_RUNNING', 'PROJECT_CODE', 'SUBMIT_SLEEP'].

This was not triggered before because we did not always try to create an ErtConfig from the config dict, but will occur from trying to parse what should be a valid everest config into an ert config.

Environment where bug has been observed

[ ] python 3.8
[ ] python 3.9
[ ] python 3.10
[ ] python 3.11
[ ] python 3.12
[ ] macosx
[ ] rhel7
[ ] rhel8
[ ] local queue
[ ] lsf queue
[ ] slurm queue
[ ] openPBS queue

equinor / ert