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**Related issue:** For #33391
# Details
This PR adds a shared method for validating a software auto-update
configuration, and updates the datastore and API handler methods to use
it.
# Checklist for submitter
## Testing
- [X] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
Tested in the UI (to ensure valid calls still work) and via API calls
(to test validation)
Scott Gress
35d9f42599