chore: add disaster simulation script

[jason-lynch]

Summary

Adds a script to simulate losing a host. This script has three different ways of simulating that loss to enable us to develop recovery steps for Swarm and Control Plane/Etcd in parallel.

Testing

NOTE - You can get this script without checking out this whole branch by doing:

git fetch origin chore/disaster-simulation:chore/disaster-simulation
git restore --source chore/disaster-simulation hack/simulate-disaster.sh

Then to use the script:

# Simulate losing Swarm on two hosts in order to lose quorum
./hack/simulate-disaster.sh swarm host-1 host-3

# Simulate losing Control Plane/Etcd on two hosts in order to lose quorum
./hack/simulate-disaster.sh etcd host-1 host-3

# Reset the fixture back to its initial state
./hack/simulate-disaster.sh reset

# Remember to include the fixture variant if you're using a non-default one
FIXTURE_VARIANT=small ./hack/simulate-disaster.sh reset

# Print the included help text to see more examples
./hack/simulate-disaster.sh --help

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