Fix: Ally won't conquer last tiles of so-called dead defender (#2954)

## Description:

When a player is conquered (has less than 100 tiles left) their gold is
transfered to the conqueror. And after that the conqueror gets the last
tiles. But if some of those last tiles are not bordered by the
conqueror, they are given to their neighbour player. However that
neighbour player can be an ally. It is percieved as a bug if an ally
conquers/annexes tiles.

This PR fixes that by adding an isFriendly check to `handleDeadDefender`
in `AttackExecution`.

Now, there are already scenarios possible currently, where a player
survives being conquered. If they have some tiles on a small island for
example. Going from that, there should be no unexpected bugs following
this change. A player can be conquered twice in a game already in the
stats too.
https://discord.com/channels/1359946986937258015/1359946989046989063/1462595261204533248

Example of this happening in an Enzo vid (with his surprised reaction)
and explanation posted here:
https://discord.com/channels/1359946986937258015/1359946989046989063/1460483209308536925

## 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/AttackExecution.ts

@@ -371,7 +371,11 @@ export class AttackExecution implements Execution {
         } else {
           for (const neighbor of this.mg.neighbors(tile)) {
             const no = this.mg.owner(neighbor);
-            if (no.isPlayer() && no !== this.target) {
+            if (
+              no.isPlayer() &&
+              no !== this.target &&
+              !no.isFriendly(this.target)
+            ) {
               this.mg.player(no.id()).conquer(tile);
               break;
             }