[Audit] SatsimGridComp: pre-migration audit

## Component

**Name:** SatsimGridComp
**Primary file:** `GEOSagcm_GridComp/GEOSphysics_GridComp/@GEOSradiation_GridComp/GEOSsatsim_GridComp/GEOS_SatsimGridComp.F90`
**Sub-repo:** GEOSradiation_GridComp
**Effort:** XL
**MAPL depth:** leaf

## Current state

- `VERIFY_(` calls: 535
- LOC: 5026

## Notes

_None._

## Links

- Parent epic: GEOS-ESM/GEOSgcm_GridComp#1241