windows support for plugin ipc (#7251)

* windows support for plugin ipc

* unix test fix

plugin/rpcplugin/main_test.go

@@ -18,7 +18,7 @@ func TestMain(t *testing.T) {
 	require.NoError(t, err)
 	defer os.RemoveAll(dir)
 
-	plugin := filepath.Join(dir, "plugin")
+	plugin := filepath.Join(dir, "plugin.exe")
 	compileGo(t, `
 		package main
 
@@ -42,13 +42,16 @@ func TestMain(t *testing.T) {
 		}
 	`, plugin)
 
-	p, ipc, err := NewProcess(context.Background(), plugin)
+	ctx, cancel := context.WithCancel(context.Background())
+	p, ipc, err := NewProcess(ctx, plugin)
 	require.NoError(t, err)
 	defer p.Wait()
 
 	muxer := NewMuxer(ipc, false)
 	defer muxer.Close()
 
+	defer cancel()
+
 	var api plugintest.API
 
 	hooks, err := ConnectMain(muxer)