Temporarily skip flaky TestDebuggerAttachDotnet test (#425)

We're still seeing this test fail on macOS and it looks like it may be
affecting Windows as well. Temporarily skip it for now.

Going to see if skipping also removes the flakes on Windows.

#403 tracks fixing the test for real / unskipping.

Fixes #419

integration_tests/integration_dotnet_test.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"sync"
@@ -627,6 +628,11 @@ func readUpdateEventLog(logfile string) ([]apitype.EngineEvent, error) {
 func TestDebuggerAttachDotnet(t *testing.T) {
 	t.Parallel()
 
+	// TODO[pulumi/pulumi-dotnet#403]: Fix flaky test.
+	if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
+		t.Skip("Temporarily skipping flaky test on macOS and Windows - pulumi/pulumi-dotnet#403")
+	}
+
 	languagePluginPath, err := filepath.Abs("../pulumi-language-dotnet")
 	require.NoError(t, err)