**Add approved & assigned issue number here:**
Resolves#4308
## Description:
When nuclear damage reduces a player's troop count, it also affects any
transports ships in the water. This works well and is useful to avoid
exploiting tranports to avoid hydro damages.
`UnitImpl.setTroops()` changes the transports troop count without
queuing a unit update. the core value changes, but the client never
receives a fresh UnitUpdate unless something else touches the ship.
- UnitImpl.ts now emits a UnitUpdate when a unit troop count actually
changes.
- NukeExecution.ts batches transport ship nuke losses, then applies one
final troop update per ship.
- Attack.test.ts now asserts the nuke tick includes a transport
UnitUpdate with the reduced troop count.
## Please complete the following:
- [N/A] I have added screenshots for all UI updates
- [N/A] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
## Please put your Discord username so you can be contacted if a bug or
regression is found:
elliotlepley
