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File system and snapshots config (#926)

## Problem

The file system type cannot be selected when adding or editing a file
system. The file system is always created with its default file system
type.

*
https://trello.com/c/JnSKpQnu/3418-3-storage-modify-basic-attributes-fstype-snapshots-etc-for-pre-defined-volumes

## Solution

Add a selector for the file system type.

* If the product allows configuring snapshots, then the selector
includes both *Btrfs* and *Btrfs with snapshots* (and the rest of
possible types).
* If there is only an option for the file system type (e.g., *swap*),
then the selector is not offered. A plain text with the unique value is
shown.

Follow-up: https://github.com/openSUSE/agama/issues/932

## Testing

* Added new unit tests
* Tested manually

## Screenshots

[Screencast from 2023-12-15
14-52-33.webm](https://github.com/openSUSE/agama/assets/1112304/feac328d-8ffd-4485-be5b-997b2aad49b6)

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