[test] add fix for rare virtualbox error (#31212)

See the vagrant issue mentioned in this commit for details. This error
has happened a couple times in packaging test CI builds with workers
using virtualbox 5.2.10r122088

Author: andyb-elastic

Vagrantfile

@@ -205,6 +205,9 @@ def provision(config,
     # Give the box more memory and cpu because our tests are beasts!
     v.memory = Integer(ENV['VAGRANT_MEMORY'] || 8192)
     v.cpus = Integer(ENV['VAGRANT_CPUS'] || 4)
+
+    # see https://github.com/hashicorp/vagrant/issues/9524
+    vbox.customize ["modifyvm", :id, "--audio", "none"]
   end
   config.vm.provision "dependencies", type: "shell", inline: <<-SHELL
     set -e