Add cron job to check for JD changes

Problem/Motivation

Add a simple cron job to check for JD changes (new or modified) for equipment, fields and field operations.

Steps to reproduce

N/A

Proposed resolution

Add a cron job that uses the existing code for making these requests. Consider moving this code into a separate service so it can be reused more easily.

Remaining tasks

Implement

User interface changes

None

API changes

None

Data model changes

None