Small refactor: nearbyUnits readonly UnitType[] (#3236)

## Description:

PR 4/x in effort to break up PR
https://github.com/openfrontio/OpenFrontIO/pull/3220. Follows on already
merged https://github.com/openfrontio/OpenFrontIO/pull/3235.

Please see if these can be merged for v30.

- **Game**/**GameImpl**/**GameView**: nearbyUnits required "UnitType |
UnitType[]" for tiles, but calls UnitGrid nearbyUnits which requires
"UnitType | readonly UnitType[]". Made the requirement the same for
Game/GameImpl/GameView nearbyUnits. This way, we don't have make a
shallow copy of the StructureTypes array everytime we want to send it as
an argument. Other callers than listNukeBreakAlliance in Util.ts are
unaffected.
- **Util.ts**: listNukeBreakAlliance needs no shallow copy of
StructureTypes anymore as argument for NearbyUnits

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] 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
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tryout33

src/core/execution/Util.ts

@@ -119,7 +119,7 @@ export function listNukeBreakAlliance(
 
   // Also check if any allied structures would be destroyed
   game
-    .nearbyUnits(targetTile, magnitude.outer, [...StructureTypes])
+    .nearbyUnits(targetTile, magnitude.outer, StructureTypes)
     .forEach(({ unit }) =>
       playersToBreakAllianceWith.add(unit.owner().smallID()),
     );

src/core/game/Game.ts

@@ -793,7 +793,7 @@ export interface Game extends GameMap {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
     includeUnderConstruction?: boolean,
   ): Array<{ unit: Unit; distSquared: number }>;

src/core/game/GameImpl.ts

@@ -895,7 +895,7 @@ export class GameImpl implements Game {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
     includeUnderConstruction?: boolean,
   ): Array<{ unit: Unit; distSquared: number }> {

src/core/game/GameView.ts

@@ -711,7 +711,7 @@ export class GameView implements GameMap {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
   ): Array<{ unit: UnitView; distSquared: number }> {
     return this.unitGrid.nearbyUnits(