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Avoid duplicated keymaps (#981)

## Problem

The list of available keymaps contains some duplicated values.

## Solution

Fix the regexp to obtain the layout and variant names from `localectl`.
Now it allows layouts with dots (e.g., *lt.std*) and variants with
dashes (e.g., *pt-nativo-epo*).

Note for reviewers: regexp can be checked with https://rustexp.lpil.uk/.

## Testing

* Added new unit tests.
* Tested manually.

## Screenshots

<details>
<summary>Toggle</summary>

![localhost_8080_(iPad Mini)
(23)](https://github.com/openSUSE/agama/assets/1112304/eaabbb77-59ea-49c7-9628-1aed4f5e1229)

![localhost_8080_(iPad Mini)
(22)](https://github.com/openSUSE/agama/assets/1112304/a8f161bb-f429-4c5d-b323-4b2f6c01eb53)

</details>

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