Task scope: Add procedure for debugging minimal ISO boot failure by interrupting the boot process.

Procedure will probably look like this:

1. Add the `spec.kernelArguments` stanza to the `infraEnv` object to interrupt the kernel boot and gain access to the root console:

# ...
spec:
  clusterRef:
    name: sno1
    namespace: sno1
  cpuArchitecture: x86_64
  ipxeScriptType: DiscoveryImageAlways
  kernelArguments:
  - operation: append
    value: rd.break=initqueue [1]
  nmStateConfigLabelSelector:
    matchLabels:
      nmstate-label: sno1
  pullSecretRef:
    name: assisted-deployment-pull-secret

[1] `rd.break=initqueue` interrupts the boot at the dracut main loop. See rd.break options for debugging kernel boot for details.

2. Run the journalctl command to diagnose the error: `# journalctl -p err` or crit or warning.

SME: Jose Gato Luis

Original description:
We already have a section for  "Troubleshooting minimal ISO boot failures".

https://access.redhat.com/documentation/en-us/assisted_installer_for_openshift_container_platform/2024/html/installing_openshift_container_platform_with_the_assisted_installer/assembly_troubleshooting#troubleshooting_minimal_iso_boot_failures
 

It could be extended to cover

• How to break the boot process before the 'rootfs' image is download it
• Some usual debuging tips here
• How to use 'InfraEnv' object to interrupt the boot process in the correct stage. So you will have a debugging root session

I wrote/Sketeched something like: https://github.com/jgato/jgato/blob/main/random_docs/debugging_AI_installation.md#interrupts-rhcos-boot-in-different-stages