Add WorkQueue.status to server and client side schemas

[urimandujano]

This PR adds the status field to WorkQueue objects and responses. The status is determined by the server when it receives a "poll" asking for a WorkQueue object and is conditional on the recency of the work queue's last_polled field.

Closes #11830

Example

Work Queue responses now include a status field, determined via last_polled and is_paused:

{
    "id": "6648ad79-a05a-490c-ac58-0f4eea8461ee",
    "created": "2024-02-02T21:58:28.664611+00:00",
    "updated": "2024-02-02T21:58:28.834000+00:00",
    "name": "wq-1",
    "description": "All about my work queue",
    "is_paused": true,
    "concurrency_limit": null,
    "priority": 1,
    "work_pool_id": "ad6678dd-e13e-4a84-92ba-cb851658d7f4",
    "filter": null,
    "last_polled": null,
    "work_pool_name": "default-agent-pool",
    "status": "PAUSED"
}

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. maintenance, fix, feature, enhancement, docs.

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[urimandujano]

I had a chance to verify this against the UI work we've done and the results look good:

[serinamarie]

Looking good!

[serinamarie]

nice!

[collincchoy]

🚀