getType() for `unique symbol` returns `typeof {nameOfVariable}` rather than `symbol`

**Describe the bug**

Version: 19.0.0

Variables declared with `unique symbol` type have a `getType()` value of `typeof {nameOfVariable}` rather than `symbol`

**To Reproduce**

Here's some code that reproduces the bug:

```ts
// test.ts
import { Project } from "ts-morph";

const code = `const aSymbol: symbol = Symbol("a");
const aUniqueSymbol: unique symbol = Symbol("b");
console.log(aSymbol, typeof aSymbol);
console.log(aUniqueSymbol, typeof aUniqueSymbol);
`;

const aSymbol: symbol = Symbol("a");
const aUniqueSymbol: unique symbol = Symbol("b");
console.log(aSymbol, typeof aSymbol);
console.log(aUniqueSymbol, typeof aUniqueSymbol);

const project = new Project();
project.createSourceFile("test_a.ts", code);

const aSymbolVariable = project.getSourceFile("test_a.ts")!.getVariableDeclarationOrThrow("aSymbol");
const aSymbolType = aSymbolVariable.getType();
console.log(`ts-morph: aSymbol's type: ${aSymbolType.getText()}`); // "symbol"

const aUniqueSymbolVariable = project.getSourceFile("test_a.ts")!.getVariableDeclarationOrThrow("aUniqueSymbol");
const aUniqueSymbolType = aUniqueSymbolVariable.getType();
console.log(`ts-morph: aUniqueSymbol's type: ${aUniqueSymbolType.getText()}`); // "symbol"
```

The output:

```terminal
$ ts-node test.ts
Symbol(a) symbol
Symbol(b) symbol
ts-morph: aSymbol's type: symbol
ts-morph: aUniqueSymbol's type: typeof aUniqueSymbol
```

**Expected behavior**

I expected the type to be the same as the `typeof` result in TypeScript; that is, `symbol`.

Start by reading CONTRIBUTING.md and running the TypeScript reproduction in test.ts, focusing on the getType() and getText() calls for the unique symbol declaration. Trace how ts-morph represents that type and add or update coverage for the reported case; done means the unique symbol variable reports symbol consistently with the expected output.

Written by the indexing model from the issue text.