Adding/removing hostpci devices forces vm recreation

[michaelze]

When adding or removing a hostpci argument to a vm resource, the vm is forced to be recreated. This should not happen, since adding/removing hostpci devices via the ui is possible. Although, it seems that a reboot would be required.

To Reproduce
Steps to reproduce the behavior:

1. Create a resource vm without a hostpci device
2. Run terraform apply
3. VM is created correctly with the device attached
4. Modify the resource, remove the hostpci device
5. Run terraform apply
6. See the vm being recreated

The same can be witnessed, when creating a vm with a hostpci device and then later remove it.

The following resource can be used in order to reproduce the issue:

resource "proxmox_virtual_environment_vm" "recreate_when_hostpci_changes" {
  name        = "recreate-when-hostpci-changes"
  description = "## TEST recreate-when-hostpci-changes"

  node_name = "foo"

  started = false

  cpu {
    cores = 1
  }

  memory {
    dedicated = 512
  }

  operating_system {
    type = "l26"
  }

  network_device {
    bridge = "vmbr0"
  }

  hostpci {
    device = "hostpci0"
    id = "81:00.8"
    rombar = true
  }
}

Expected behavior
Adding/removing hostpci devices to/from a vm should not force recreation of the vm.

Additional context
Provider version: Tested with 0.29.0 but the problem was present since the introduction of the hostpci argument
Terraform version: v1.5.1
OS: Running from wsl on Windows 10

I'll be trying to come up with a pull request.