Have ability to exercise biofuels

Biofuels are needed for the CMIP7 future scenarios. In order to turn them on, we need datasets that have them, as well as a parameter file that doesn't collapse them to tropical corn. Biofuels have been in the code, but we haven't been exercising it. So there may be issues with getting it work, as well as tuning it in CMIP7.

> Talked about biofuels needed for future scenarios. Will need to add a namelist item or change to the parameter file that doesn't collapse it to tropical corn. And add datasets and testing for it. I'll make an issue for this.

I looked at the code a bit to remind myself what may need changing. In pftconMod.F90 I see two relevant variables:
```
mergetoclmpft
is_pft_known_to_model
```
The latter seems to be derived from the former, which is set in the paramfile. We can look more carefully when it's time to work on this.

_Originally posted by @slevis-lmwg in https://github.com/ESCOMP/CTSM/discussions/2206#discussioncomment-17910502_

Definition of done:
- [ ] Add a test surface dataset and parameter file that can be used to exercise it
- [ ] Add the test in and get it to work
- [ ] Run longer simulations to make sure it's working correctly
- [ ] Tune any parameters as needed
- [ ] Bring in the future scenarios for CMIP7 where this will be turned on by default