#2172 - Push Celery Migration

[k-macmillan]

Description

issue #2172

Changes in This PR

V2 Push Notifications

• Update status code for service unauthorized from 401 to 203
• Updated push notification flow:
  • Validates requests before queuing deliver_push and returns V2PushPayload dataclass.
  • Validated payload sent to deliver_push celery task

Celery Provider Tasks

• Added deliver_push celery task to handle push notifications using vetext_client, instead of being handled directly by the API.
• Formatting payload to send to Vetext happens before send_push_notification method using Vetext Client
• Implemented retry logic with AutoRetryException for transient failures.

Config Updates

• Registered app.celery.provider_tasks in Celery imports.
• Routed deliver_push to SEND_EMAIL queue.

Internal REST API

• Minor refactor: Combined jsonify imports.
• Added /502 and /sleep endpoints for debugging.

Mobile App Registry

• Improved error handling: Logs & raises when accessing unregistered apps.

How Has This Been Tested?

• Deploy OK

Checklist

• I have assigned myself to this PR
• PR has an appropriate title: #9999 - What the thing does
• PR has a detailed description, including links to specific documentation
• I have added the appropriate labels to the PR.
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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to any documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works. Testing guidelines
• I have ensured the latest main is merged into my branch and all checks are green prior to review
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• The ticket was moved into the DEV test column when I began testing this change