Unify Lima user home inside guest for all platforms

[arixmkii]

Fixes #3364

I spent some time trying to understand if this code really makes sense. My conclusion is that it is probably the remains from the times, where the idea of mounting HOST home into GUEST home was explored. Since then there was a decision to have GUEST home separately, because it can be used for Lima GA needs. I could not think of any reason why GUEST home should be different from home directories on other platforms. This change remove all of the Windows specifics for GUEST home directory (keeping all other platform specific parts).

I tested this with integration tests using WSL2 and QEMU https://github.com/arixmkii/qcw/actions/runs/14022917109/job/39274813343

[arixmkii]

Ok, I see one problem with it now

local username "DOMAINNAME\\Arthu" is not a valid Linux username

So, it would always be /home/lima.linux as host dir, but if this is really a problem, then probably it is better to add OS specific processing to Username trying to extract Username w/o domain instead trying to replicate the Windows Home dir path into Linux path

Create a task for investigation of this.

[Copilot]

Pull Request Overview

This PR unifies the guest home directory across all platforms by removing Windows-specific handling for the guest home directory.

• Removed Windows-specific logic for transforming the guest home directory in pkg/osutil/user.go.
• Updated the test in pkg/limayaml/defaults_test.go to always set the home directory using a unified, Linux-style format.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/osutil/user.go	Removed Windows-specific home transformation to support a unified guest home path.
pkg/limayaml/defaults_test.go	Adjusted test to unconditionally apply the unified home directory format.