feat: Support Multipath

[aidanleuck]

Context from this original slack post
https://cloud-native.slack.com/archives/C0707M8UEU8/p1753221318973259

Is your feature request related to a problem? Please describe.

Installing Kairos on Multipath disks even fails even when labeled properly. This results in an error saying COS_GRUB cannot be found.

Describe the solution you'd like

The ability to install Kairos on a machine using Multipath as it's boot disk

I've opened two PRs to address this issue.

What I've tested

Installation of Kairos on a Multipath Device/Non-multipathed device
Boot of Kairos on a Multipath Device/Non-multipathed device
Upgrade of Kairos on a Multipath Device/Non-multipathed device

[jimmykarily]

I triggered the e2e tests here: #3614

[jimmykarily]

Both PRs now merged but we'll need to wait for the next round of version bumps in the various repos and the next release for this to be shipped.