net: skip tests that use netsh on the windows-arm64-10 builder

These tests sometimes hang on Windows 10 on ARM64, due to what appears
to be a platform bug. Since we have not yet observed any such hangs on
the windows-arm64-11 builder, I am leaving the tests otherwise enabled
on the theory that the platform bug may have been fixed in Windows 11.

Fixes #52082 (at least for now).

Change-Id: I79161f485b1921f083ebcf01865d6e7b0178ef70
Reviewed-on: https://go-review.googlesource.com/c/go/+/397315
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

Author: Bryan C. Mills

src/net/net_windows_test.go

@@ -8,6 +8,7 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+	"internal/testenv"
 	"io"
 	"os"
 	"os/exec"
@@ -205,6 +206,13 @@ func runCmd(args ...string) ([]byte, error) {
 }
 
 func checkNetsh(t *testing.T) {
+	if testenv.Builder() == "windows-arm64-10" {
+		// netsh was observed to sometimes hang on this builder.
+		// We have not observed failures on windows-arm64-11, so for the
+		// moment we are leaving the test enabled elsewhere on the theory
+		// that it may have been a platform bug fixed in Windows 11.
+		testenv.SkipFlaky(t, 52082)
+	}
 	out, err := runCmd("netsh", "help")
 	if err != nil {
 		t.Fatal(err)