WSL: Implement docker plugin integration in go

[mook-as]

This avoids assumptions about what is available inside the target distros (we no longer require /bin/sh and ln).

This was spawned from #5832.

[ericpromislow]

Unit tests fail on WIndows.

First, every time I run it I get this message:

For this generation to compile you need to have some packages in your go.mod:

        * github.com/go-openapi/runtime
        * github.com/jessevdk/go-flags

I still see this even after running go mod tidy in src/go/wsl-helper. Maybe it needs to be run somewhere else?

Then the tests fail with a large number of lines of errors, starting like so:

--- FAIL: TestContainersCreate (0.06s)
    --- FAIL: TestContainersCreate/bind (0.03s)
        containers_create_windows_test.go:57:
                Error Trace:    C:/Users/eric/rancher-desktop/src/go/wsl-helper/pkg/dockerproxy/mungers/containers_create_windows_test.go:57
                Error:          Received unexpected error:
                                could not translate bind path C:\Users\eric\AppData\Local\Temp\TestContainersCreatebind3996221649\001: error getting WSL path: exec: "wsl": executable file not found in %PATH%
                Test:           TestContainersCreate/bind
    --- FAIL: TestContainersCreate/mount (0.03s)
        containers_create_windows_test.go:92:
                Error Trace:    C:/Users/eric/rancher-desktop/src/go/wsl-helper/pkg/dockerproxy/mungers/containers_create_windows_test.go:92
                Error:          Received unexpected error:
                                could not translate mount path C:\Users\eric\AppData\Local\Temp\TestContainersCreatemount2728444168\001: error getting WSL path: exec: "wsl": executable file not found in %PATH%
                Test:           TestContainersCreate/mount
FAIL
FAIL    github.com/rancher-sandbox/rancher-desktop/src/go/wsl-helper/pkg/dockerproxy/mungers    0.333s
ok      github.com/rancher-sandbox/rancher-desktop/src/go/wsl-helper/pkg/dockerproxy/platform   (cached)
ok      github.com/rancher-sandbox/rancher-desktop/src/go/wsl-helper/pkg/dockerproxy/util       (cached)
--- FAIL: TestRemoveHostFileEntry (0.00s)
    hostfile_test.go:82:
                Error Trace:    C:/Users/eric/rancher-desktop/src/go/wsl-helper/pkg/host/hostfile_test.go:82
                Error:          Received unexpected error:
                                rename C:\Users\eric\AppData\Local\Temp\tmpRDHostsFile1155500918 C:\Users\eric\AppData\Local\Temp\TestRemoveHostFileEntry3891314604\001\hosts: Access is denied.
                Test:           TestRemoveHostFileEntry

[mook-as]

Fixed the second test failure (from hostfile, which wasn't part of this PR). The other failure about failing to find wsl will need to be fixed on your system… you're expected to have WSL correctly installed before development.

[ericpromislow]

wsl.exe is definitely in the path. It's at c:\Windows\system32\wsl.exe --- nothing would work if that directory wasn't in $PATH

[ericpromislow]

Works, tests pass when the r-d distro has been installed, and code is readable, so approved