USFS_GTAC_LCMS: cleanup

Pairs with #523

STAC Collection Jsonnet:
- Add a version variable
- Fit to 80 columns
- Match the visualization lookat to the example script
- Remove unnecessary `.0`
- Tighten visualization multi-line entries

Example script:
- Add "thematic" to the "Change" display name

PiperOrigin-RevId: 529090954

Author: schwehr