internal/trace/v2: disable TestTrace* tests on Windows for now

There are a couple known issues here. Disable the tests for now so it's
not blocking anyone.

For #64061.

Change-Id: Iaaa9007b93ea78739cb7d2b59b2a1715de29d72b
Reviewed-on: https://go-review.googlesource.com/c/go/+/541197
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

src/internal/trace/v2/trace_test.go

@@ -524,6 +524,10 @@ func TestTraceManyStartStop(t *testing.T) {
 func testTraceProg(t *testing.T, progName string, extra func(t *testing.T, trace, stderr []byte, stress bool)) {
 	testenv.MustHaveGoRun(t)
 
+	if runtime.GOOS == "windows" {
+		t.Skip("temporarily disabled on Windows for #64061")
+	}
+
 	// Check if we're on a builder.
 	onBuilder := testenv.Builder() != ""