Controller should check if the Talos image is available

It should also wait until the image is available. This would prevent jobs from being created until the image is available.

Dmesg:

```
user: warning: [2025-10-15T13:28:14.6365505Z]: level=info msg=fetch failed after status: 500 Internal Server Error host=factory.talos.dev image=factory.talos.dev/metal-installer/05b4a47a70bc97786ed83d200567dcc8a13f731b164537ba59d5397d668851fa:v1.11.3
```