moveToDirectory loses the import statements' extension

**Describe the bug**

Version: 25.0.1

When `moveToDirectory` is used, the import statements' extensions are lost.

**To Reproduce**

```ts
import { Project } from "ts-morph";

const project = new Project({
tsConfigFilePath: path.join(packagePath, 'tsconfig.json'),
manipulationSettings: {
indentationText: IndentationText.TwoSpaces,
quoteKind: QuoteKind.Double,
insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: true,
useTrailingCommas: true,
},
});

sourceFile.addImportDeclaration({
moduleSpecifier: '../App.js',
namedImports: ['App'],
});

sourceFile.moveToDirectory('subDir');
```

**Expected behavior**

Without `moveToDirectory` is used, import statement looks like this.

```ts
import { App } from '../App.js';
```

After

```ts
import { App } from '../../App'; // .js extension is lost.
```

Other move methods like `moveImmediately` also seems to be affected.

tsconfig

```json
{
"compilerOptions": {
"lib": ["ES2022"],
"target": "ES2022",
"module": "Node16",
"moduleResolution": "node16",
"declaration": true,
"strict": true,
"skipLibCheck": true,
"noFallthroughCasesInSwitch": true,
"noEmitOnError": true
}
}
```

Read CONTRIBUTING.md, then run the supplied TypeScript reproduction and trace sourceFile.moveToDirectory and the related moveImmediately path. Compare the import declaration before and after moving; done means relative imports retain their explicit .js extension.

Written by the indexing model from the issue text.