Add configuration files for long control simulations

[oliverwm1]

This PR updates the single_fv3gfs_runs workflow. Specifically, it adds configurations for year-long control runs (both free-running and nudged) and updates the diag_tables to include monthly-mean averages in the output, and a few more variables at higher frequency.

It also makes a small simplification to the submit_jobs.py script.

[AnnaKwa]

Could the name of the workflow be a bit more descriptive of the type of jobs it contains (long control runs)? Also could you add your description into a short README snippet?

[AnnaKwa]

File changes look good to me. Just a couple minor comments.

[oliverwm1]

Could the name of the workflow be a bit more descriptive of the type of jobs it contains (long control runs)? Also could you add your description into a short README snippet?

The workflow already exists, so I'd prefer to not rename it unless you feel strongly.

Good call on updating the README. I added a table of all the configurations that are currently in the workflow. Let me know if you think it needs more.

[AnnaKwa]

Oh, I see. I thought this was a new workflow for just long control runs. As long as the usage is described in the README, I'm fine with this. Approved!