Map data workflow improvements

[pdil]

Updated build-map-data workflow to be more resilient.

• Broke up workflow into multiple jobs
  • Allows appropriate notifications to be sent without adding conditional checks to every step.
• Workflow no longer fails if "404 not found" is encountered
  • This is not considered a failure since it just means the map data files have not been updated yet.
• Improved shapefiles.py to result in fewer failures