NAS-128546 / 24.10 / Improvements requested by UI team for new enclosure.dashboard

[yocalebo]

The UI team is currently implementing the changes required to consume webui.enclosure.dashboard but they're missing some key items that make it awkward to deal with on their side. This does 3 primary things:

1. add drive_bay_number key to webui.enclosure.dashboard
2. add drive_bay_number and id keys to disk.get_unused
3. use device.get_disks in disk.get_unused instead of querying the disk table. The reason why we don't query the database table is because we have seen various edge-cases where disks are updated in kernel but our database doesn't get updated. This is hard to predict and is even harder to properly handle. The kernel already "caches" the disk info that we need so device.get_disks goes directly to the source of truth. This method has been optimized tremendously and has been proven to perform tolerably compared to querying the db.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-128546

[bugclerk]

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