fix: ensure usrlocalsharelima.Dir() works when called from tests

[Konikz]

Fixes #3208

During tests, usrlocalsharelima.Dir() fails to find the guestagent binary because the test executable is in a temp directory. This PR adds a test that verifies the binary can be found in both expected locations:

1. Same directory as the test executable
2. share/lima directory relative to the test executable

The test creates dummy binaries in both locations and verifies Dir() can find them. This ensures the function works correctly in test environments where os.Executable returns a temp directory path.

[jandubois]

There is something wrong with this PR; it adds almost 2000 lines, many unrelated to the issue it is supposed to fix. This may be responsible for the various test failures.

Don't merge master into your branch, but rebase on latest master if there are merge conflicts.

Please squash commits into a single commit and add a DCO signature.

Thanks!

[jandubois]

There is something wrong with this PR; it adds almost 2000 lines, many unrelated to the issue it is supposed to fix. This may be responsible for the various test failures.

@Konikz Are you planning to fix this PR? There is nothing we can do with it until the extraneous commits are removed and the lint failures addressed.

[Konikz]

@jandubois I'll rectify the issue with the pr

[jandubois]

Thanks, LGTM

I would change the logic to use Must(), but feel free to ignore if you like your approach better.

However, you do need to squash commits before we can merge.

[jandubois]

I would just cache the return value of the function because it is constant over the lifetime of the process. Import Must at the top:

import (
    …
    . "github.com/lima-vm/lima/pkg/must"
)

and then use

Suggested change

	var executable = os.Executable
	var self = Must(os.Executable())

later you can simply assign to it:

    self = limactlPath

See osutil/user.go for an example of using Must().

[Konikz]

Sir @jandubois ,
I have tried implementing the above suggestions, I need your suggestion with the failing tests.