test: Add expected AppArmor messages for TestMachines.testAddDisk on ubuntu-stable
test: Add expected AppArmor messages for TestMachines.testAddDisk on ubuntu-stable

This has a similar profile as debian-testing, and it sometimes also
happens for `denied_mask="wr"`.

Closes #13745
deryni/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,cockpit-project/cockpit,garrett/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpituous/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,cockpituous/cockpit,garrett/cockpit,cockpit-project/cockpit,deryni/cockpit,garrett/cockpit,mvollmer/cockpit,cockpituous/cockpit