build: disable cmount tests under macOS and the CI since they are locking up

This fixes #5951 and allows the macOS builds to run again

See #5960 for more info.

cmd/cmount/mount_test.go

@@ -10,11 +10,17 @@
 package cmount
 
 import (
+	"runtime"
 	"testing"
 
+	"github.com/rclone/rclone/fstest/testy"
 	"github.com/rclone/rclone/vfs/vfstest"
 )
 
 func TestMount(t *testing.T) {
+	// Disable tests under macOS and the CI since they are locking up
+	if runtime.GOOS == "darwin" {
+		testy.SkipUnreliable(t)
+	}
 	vfstest.RunTests(t, false, mount)
 }