Enable the @typescript-eslint/no-unsafe-assignment eslint rule (#1832)

## Description:

Enable the `@typescript-eslint/no-unsafe-assignment` eslint rule.

Fixes #1781

## 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

src/core/execution/FakeHumanExecution.ts

@@ -297,7 +297,7 @@ export class FakeHumanExecution implements Execution {
       UnitType.SAMLauncher,
     );
     const structureTiles = structures.map((u) => u.tile());
-    const randomTiles: (TileRef | null)[] = new Array(10);
+    const randomTiles: (TileRef | null)[] = new Array<TileRef | null>(10).fill(null);
     for (let i = 0; i < randomTiles.length; i++) {
       randomTiles[i] = this.randTerritoryTile(other);
     }