agama-project / agama / 13965282480

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Allow to delete mandatory filesystems (#2160)

This is a re-incarnation of #2129, that was automatically closed by
Github.

## Problem

Agama does not allow to delete the "/" partition nor the drive
containing it.

But that was only implemented to hide some limitations of the current
UI. In fact, deleting "/" or any other mandatory partition should be
allowed. Of course, a proposal without mandatory mount paths is not
valid and cannot be computed. But that doesn’t mean the user cannot
delete them temporarily in order to create it elsewhere.

## Solution

- Detect and properly report when mandatory partitions are missing.
- Adapt the UI to not panic (ie. resort to an empty state) when there
are configuration errors that can actually be fixed by using the UI.
- Allow to delete all partitions (including "/").
- Adapt the "do not use" button of the drives to the new situation

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