Crash when cancelling LXD builder

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#### Overview of the Issue

LXD builder crashes when terminated early

#### Reproduction Steps

Start an LXD builder, and cancel (Ctr-C) early.

### Packer version

Packer v1.10.0

### Simplified Packer Template

```
packer {
required_plugins {
lxd = {
source = "github.com/hashicorp/lxd"
version = "~> 1"
}
}
}

source "lxd" "ubuntu" {
image = "ubuntu-minimal:jammy"
}

build {
name = "builder"
sources = [
"source.lxd.ubuntu"
]
}

```

### Operating system and Environment details

Linux 6.5.0-10-generic #10-Ubuntu SMP PREEMPT_DYNAMIC Fri Oct 13 13:49:38 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
PRETTY_NAME="Ubuntu 23.10"
NAME="Ubuntu"
VERSION_ID="23.10"
VERSION="23.10 (Mantic Minotaur)"

[crash.log](https://github.com/hashicorp/packer/files/13761647/crash.log)

Start by reproducing the cancellation described in the issue with the supplied LXD builder template, then inspect the linked crash.log and the LXD builder's cancellation path. Done means cancelling an early build no longer crashes Packer and the existing reproduction completes cleanly.

Written by the indexing model from the issue text.