test: Explicitly unmount filesystem before shrinking it
test: Explicitly unmount filesystem before shrinking it

Closes #11598
mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpituous/cockpit,cockpituous/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,cockpit-project/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,deryni/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,deryni/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit