agama-project / agama / 15203364908 / 3 – web

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UI: handle reused MD RAIDs that are already included in the configuration (#2346)

## Problem

If a storage configuration includes reusing an existing MD RAID device,
such a device is not displayed at the Agama configuration UI. But
actually that case is not so different from using a disk.

## Solution

This extends the component `ConfigEditor` to also display reused MD
RAIDs, offering the same capabilities that are there for disks (like
creating partitions or defining what to do with the existing ones).


![md0b](https://github.com/user-attachments/assets/57e3be40-79fd-469e-aa7f-bf461780eb8b)


![md0a](https://github.com/user-attachments/assets/2181aabd-49d9-46c6-8eb9-66d9b2896d27)

This does not offer any possibility to remove the RAID from the
configuration or to add a new RAID. It only works with RAIDs that are
already present at the loaded configuration.

## Implementation notes

Some of the pre-existing components like `DriveEditor`,
`SpacePolicySelection` or `PartitionsPage` use the old queries at
`config-model.ts` to communicate with the backend. Something that is
deprecated in favor of
https://gist.github.com/joseivanlopez/a8d1e4269e6f1c8d41837dfd89fb556d?permalink_comment_id=5569616

This pull request gives several steps on the agreed direction, but a few
inner components still use the old approach.

## Testing

- Tested manually
- Backend tests reorganized and expanded
- Frontend tests updated

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