proxmox-ubuntu-22.04: Make boot command wait times more robust

[tbabej]

This increases the wait times after pressing Enter key from 5 second to 10 seconds during the boot command insertion, which more results in more robust VM startup process. Previous value of 5 seconds can result in failure due to insufficient wait time:

==> proxmox-iso.ubuntu-2204: Typing the boot command
==> proxmox-iso.ubuntu-2204: Error running boot command:
    Put "https://10.9.1.0:8006/api2/json/nodes/pm0/qemu/104/sendkey": EOF

[linux-foundation-easycla]

• ❌ - login: @tbabej / name: Tomas Babej . The commit (6794dc1) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[k8s-ci-robot]

Hi @tbabej. Thanks for your PR.

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[drew-viles]

Hi @tbabej could you sign the CLA please? We can process this change then - seems sensible to me though!

[mboersma]

@tbabej could you sign the Kubernetes CLA through the link in the comment above? This looks like a simple change we can merge once that is done. Thanks!