Refactor job submission

[CodyCBakerPhD]

1. Do not write a 'last_submitted.json` file to the queue; purge all code related to that
2. Instead, simplify by creating a .submitted file adjacent to each sbatch script
3. In order to qualify for job submission, a job must
   3a. be within the subset of the state.jsonl entries that do not have logs or output
   3b. must NOT have a .submitted file adjacent to the sbatch script