Ignore ERROR_SHARING_VIOLATION error on windows

When removing the gvproxy pid file, under CI conditions we could hit a
case where the PID file being removed seemed to have an open handle on
it still.  I could not find anything in podman that left an open handle
and gvproxy would have quit before this, so we think it is likely
another process holding it.  I could not find root cause with CI because
I could not trip the flake.

this new code allows windows (specifically hyperv bc WSL does not use
GVProxy) to ignore an ERROR_SHARING_VIOLATION.

Signed-off-by: Brent Baude <bbaude@redhat.com>

pkg/machine/gvproxy.go

@@ -27,5 +27,5 @@ func CleanupGVProxy(f define.VMFile) error {
 	if err := waitOnProcess(proxyPid); err != nil {
 		return err
 	}
-	return f.Delete()
+	return removeGVProxyPIDFile(f)
 }

pkg/machine/gvproxy_unix.go

@@ -8,6 +8,7 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/containers/podman/v5/pkg/machine/define"
 	psutil "github.com/shirou/gopsutil/v3/process"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
@@ -72,3 +73,9 @@ func waitOnProcess(processID int) error {
 	}
 	return backoffForProcess(p)
 }
+
+// removeGVProxyPIDFile is just a wrapper to vmfile delete so we handle differently
+// on windows
+func removeGVProxyPIDFile(f define.VMFile) error {
+	return f.Delete()
+}

pkg/machine/gvproxy_windows.go

@@ -1,11 +1,14 @@
 package machine
 
 import (
+	"errors"
 	"os"
 	"time"
 
+	"github.com/containers/podman/v5/pkg/machine/define"
 	"github.com/containers/winquit/pkg/winquit"
 	"github.com/sirupsen/logrus"
+	"golang.org/x/sys/windows"
 )
 
 func waitOnProcess(processID int) error {
@@ -44,3 +47,13 @@ func waitOnProcess(processID int) error {
 
 	return nil
 }
+
+// removeGVProxyPIDFile special wrapper for deleting the GVProxyPIDFile on windows in case
+// the file has an open handle which we will ignore.  unix does not have this problem
+func removeGVProxyPIDFile(f define.VMFile) error {
+	err := f.Delete()
+	if err != nil && !errors.Is(err, windows.ERROR_SHARING_VIOLATION) {
+		return err
+	}
+	return nil
+}