openSUSE / agama / 9853207055

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feat(storage): more accurate info about resizing (#1428)

## Problem

The information about resizing devices shown by the UI for finding free
space is not 100% accurate. Sometimes it allows selecting to resize a
device but the device cannot be resized.

## Solution

* D-Bus provides more accurate information about resizing.
* The UI does not allow selecting "resize" if the device cannot be
resized.
* The UI offers a button to show information about the device (either
reasons why it cannot be shrunk or total shrinkable size).

<details>
<summary>Toggle screenshots</summary>

![localhost_8080_
(15)](https://github.com/openSUSE/agama/assets/1112304/e7658c0a-696a-4765-bb13-6ab8be52a334)

![localhost_8080_
(16)](https://github.com/openSUSE/agama/assets/1112304/15f0018a-21ca-4075-b166-4e3e323b7455)

![localhost_8080_
(17)](https://github.com/openSUSE/agama/assets/1112304/80202529-79b7-4231-9fac-01bb99e77b45)

</details>

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