borrowLendUserState: widen health states and healthFactor

[joeblau]

Problem

src/api/info/_methods/borrowLendUserState.ts:67,73 types health as only "healthy" and healthFactor as null only.

Upstream (nktkas#174) widened this to:

• health: "healthy" | "atRisk" | "marketLiquidatable" | "backstopLiquidatable"
• healthFactor: string | null

Fix

Widen the schema and add a parse test for each new health state.