fix: Worker should only fetch async jobs

[carlosgjs]

This pull request introduces a new backend type for machine learning job execution and updates job fetching logic to only retrieve jobs intended for asynchronous processing.

Modified the get_jobs function in trapdata/antenna/client.py to filter jobs by the backend parameter, ensuring only jobs meant for async processing are fetched (MLBackend.ASYNC_API).

See corresponding antenna fix: RolnickLab/antenna#1118, it needs to be merged and deployed before this PR.

Tested against the above PR in antenna.

Summary by CodeRabbit

• New Features
  • Added backend type selection for job retrieval and management. Users can now filter jobs based on their execution mode, with support for both synchronous and asynchronous processing workflows. This enhancement provides improved control over job processing strategies and enables targeting of async-processing jobs specifically.

[coderabbitai]

📝 Walkthrough

Walkthrough

A new MLBackend enum-like class was introduced with two backend type constants (SYNC_API and ASYNC_API), and the job-fetching request was updated to filter jobs using the ASYNC_API backend parameter.

Changes

Cohort / File(s)	Summary
Backend Type Definition trapdata/antenna/schemas.py	New MLBackend class added as a string subclass with two constants: SYNC_API and ASYNC_API for distinguishing job execution modes.
Client Job Filtering trapdata/antenna/client.py	Import of MLBackend added; get_jobs request now includes backend parameter set to MLBackend.ASYNC_API to filter async-processing jobs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A backend type hops into view,
With ASYNC running swift and true,
Jobs now filter by their way,
Constants gleam in schemas' display! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: Worker should only fetch async jobs' directly and clearly summarizes the main change: filtering the worker to retrieve only asynchronous jobs via the MLBackend.ASYNC_API parameter.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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