[Project] Prevent changes to survey from making data inaccessible

We currently show BSWs (Big Scary Warnings) in most cases when the survey organizer is about to do something destructive. We should instead prevent data loss from occurring by flagging fields as deleted and prevent changes which would break data consistency. Several cases where data would be corrupt:

| Destructive action | New strategy | Android app | Survey editor (web) | Main dashboard (web) |
| -------- | ------- | ------- | ------- | ------- |
| Delete job | Flag jobs as "deleted" | Hide deleted | P0: Hide deleted
P2: Show deleted and allow un-delete | P0: Hide in job list
P2: Show as "deleted" in job list |
| Delete task | Flag tasks as "deleted" | " | " | Only show in submission with related data |
| Delete multiple choice option | " | " | " |
| Change to incompatible task type | Disallow change once published | n/a | n/a | n/a |
| Edit question / task instructions | TBD | | | |
| Edit task | TBD | | | |
| Edit LOI location | TBD | | | |
| Edit multiple choice options | TBD | | | |