probes, e2e tests: improve test readability by adding `When` clauses
probes, e2e tests: improve test readability by adding `When` clauses

This commit removes a boolean parameter from the table, which, when
enabled just executes more code. That is a clear sign that everything
else on the table is just the setup stage for this particular test,
which asserts the VMI readiness depends on the availability of the
qemu-guest-agent.

Signed-off-by: Miguel Duarte Barroso <c798d3f0e4fda7badfc3bbd91babde7ebd48b6c2@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt