Improve the LXD init experience
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Issue body
### Bug Description
e.g. no lxd init, rockcraft pack, failed with a cryptic message, did lxd init, rockcraft pack again
rockcraft should check if LXD is properly installed and configured
PO for LXD says there’s an easy way to check for this
### To Reproduce
start from clean system
### Environment
Ubuntu 24.04 fresh
### rockcraft.yaml
```shell
.
```
### Relevant log output
```shell
.
```
Evaluation history
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