fix(vm): missing disks when importing VM to a TF state

[bpg]

Contributor's Note

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have added / updated templates in /example for any new or updated resources / data sources.
• I have ran make example to verify that the change works as expected.

Proof of Work

Having this VM in PVE:

Import:

❯ terraform import proxmox_virtual_environment_vm.test pve/1000
proxmox_virtual_environment_vm.test: Importing from ID "pve/1000"...
proxmox_virtual_environment_vm.test: Import prepared!
  Prepared proxmox_virtual_environment_vm for import
proxmox_virtual_environment_vm.test: Refreshing state... [id=1000]

Import successful!

The resources that were imported are shown above. These resources are now in
your Terraform state and will henceforth be managed by Terraform.

Check the state:

❯ terraform state show proxmox_virtual_environment_vm.test
# proxmox_virtual_environment_vm.test:
resource "proxmox_virtual_environment_vm" "test" {
    acpi                    = true
    bios                    = "seabios"
    id                      = "1000"
    ipv4_addresses          = [
        [
            "127.0.0.1",
        ],
        [
            "192.168.3.247",
        ],
    ]
    ipv6_addresses          = [
        [
            "::1",
        ],
        [
            "fe80::be24:11ff:fec2:8b6d",
        ],
    ]
    keyboard_layout         = "en-us"
    mac_addresses           = [
        "00:00:00:00:00:00",
        "BC:24:11:C2:8B:6D",
    ]
    name                    = "test"
    network_interface_names = [
        "lo",
        "eth0",
    ]
    node_name               = "pve"
    scsi_hardware           = "virtio-scsi-pci"
    started                 = true
    tablet_device           = true
    tags                    = []
    template                = false
    vm_id                   = 1000

    agent {
        enabled = true
        timeout = "15m"
        trim    = false
        type    = "virtio"
    }

    cpu {
        cores      = 2
        flags      = []
        hotplugged = 0
        limit      = 0
        numa       = false
        sockets    = 1
        type       = "qemu64"
        units      = 1024
    }

    disk {
        cache             = "none"
        datastore_id      = "local-lvm"
        discard           = "on"
        file_format       = "raw"
        interface         = "virtio0"
        iothread          = true
        path_in_datastore = "vm-1000-disk-0"
        size              = 20
        ssd               = false
    }

    initialization {
        datastore_id      = "local-lvm"
        interface         = "ide2"
        user_data_file_id = "local:snippets/cloud-config.yaml"

        ip_config {
            ipv4 {
                address = "dhcp"
            }
        }
    }

    memory {
        dedicated = 2048
        floating  = 0
        shared    = 0
    }

    network_device {
        bridge      = "vmbr0"
        enabled     = true
        firewall    = false
        mac_address = "BC:24:11:C2:8B:6D"
        model       = "virtio"
        mtu         = 0
        queues      = 0
        rate_limit  = 0
        vlan_id     = 0
    }

    operating_system {
        type = "l26"
    }
}

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Closes #782

[mergify]

🤖 LGTM! beep boop