Unify example dataset in configs

[joecummings]

We use alpaca cleaned and alpaca. Should just use one for our example datasets.

[RdoubleA]

There are memory and perf implications with using one or the other, I think some were purposely set to cleaned or normal alpaca but not sure, cc @rohan-varma

[rohan-varma]

I think @ebsmothers has more context on this, IIUC some were set to clean when we were trying to replicate existing studies.

[ebsmothers]

Personally I would just recommend making cleaned the default as that's what most folks seem to have converged on