[PR #7521/b4a2e9da backport][stable-8] Lxd instance not found fix false positives

[patchback]

This is a backport of PR #7521 as merged into main (b4a2e9d).

SUMMARY

lxd: avoid false positives in "instance not found" detection in the lxd connection plugin

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

lxd connection plugin

ADDITIONAL INFORMATION

before:

fatal: [my-rpi-399]: UNREACHABLE! => {
    "changed": false,
    "msg": "instance not found: my-rpi-399",
    "unreachable": true
}

after:

fatal: [my-rpi-399]: FAILED! => {
    "ansible_facts": {},
    "changed": false,
    "failed_modules": {
        "ansible.legacy.setup": {
            "failed": true,
            "module_stderr": "/bin/sh: 1: /usr/bin/python3: not found\nError: Command not found\n",
            "module_stdout": "",
            "msg": "The module failed to execute correctly, you probably need to set the interpreter.\nSee stdout/stderr for the exact error",
            "rc": 127
        }
    },
    "msg": "The following modules failed to execute: ansible.legacy.setup\n"
}