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feat(storage): config support to reuse file systems (#1575)

Allow using *reuseIfPossible* for a *filesystem* section in the storage
JSON config. The
[auto_storage](https://github.com/openSUSE/agama/blob/master/doc/auto_storage.md)
document proposes to have a *reuse* property, but *reuseIfPossible* was
used instead, see
https://github.com/openSUSE/agama/pull/1575#pullrequestreview-2282229940:

If *reuseIfPossible* is true, then Agama will try to reuse the file
system, if any. In that case, some other properties from the
*filesystem* section would be ignored.

Example:

~~~json
{
  "search": "/dev/vda1",
  "filesystem": {
    "reuseIfPossible": true,
    "path": "/logs",
    "type": "xfs",
    "mkfsOptions": ["rw"]
  }
}
~~~

The properties *type* and *mkfsOptions* would be considered by Agama
only if the file system is not finally reused.

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