Improve consistency and labeling of escalation functions

[brtietz]

Community solar analysis for bill savings requires some cross referencing between the TPO host model and the community solar model. This can be confusing, because the TPO lease and PPA escalation inputs do not apply inflation by default (this is consistent with the PPA inputs elsewhere) but the subscription revenue inputs in community solar do apply inflation by default.

Definitely label these inputs more clearly (the electricity rates page is a good example of a clear label)

Consider whether any of the escalation functions in community solar need to change (are these more similar to PPA agreements than costs?)

Workaround for now is to subtract inflation from the escalation number when applying it to the community solar inputs.