MoreCast: Rename bias columns

**Describe the task**
There column names for bias corrected weather columns is confusing for weather forecasters. Eg.) Many forecasters assume "RDPS bias" is the difference between the model forecast and observed values. This task is to rename bias corrected columns so they don't cause confusion.

**Acceptance Criteria**
- [ ] Rename all bias corrected columns from MODEL bias to MODEL adjust

**Additional context**
- Add any other context about the task here.
- Or here

No file or test is named in the issue. Start by locating the MoreCast code and its bias-corrected weather column definitions or references, then identify every MODEL bias column and verify that each is renamed to MODEL adjust wherever it is exposed to forecasters.

Written by the indexing model from the issue text.