This issue tracks testing that if we fail a particular action in a saga, we can safely unwind (performing undo actions) and leave the system in a "clean" state.

• Instance create: [nexus] Add tests for instance_create unwind safety #1843
• Instance delete
• Disk create: [nexus] Make 'disk_create' saga unwind safe, add tests for it #1835
• Disk Delete
• Snapshot Create: [nexus] Make snapshot-create saga unwind-safe #2093
• Snapshot Delete
• Volume Delete
• Volume Remove ROP
• Project Creation: [nexus] Make project creation unwind safe, add tests #2087
• Project Deletion
• VPC Creation: [nexus] Make the VPC creation saga unwind-safe, add tests #2086
• VPC Deletion
• Instance Migration

If other sagas are added without unwind safety tests, they should be added to this list.

Related to #1799, #2094