Preserve computed property in `--isolatedDeclarations` emit

### 🔍 Search Terms

isolated declarations, computed properties

### ✅ Viability Checklist

- [x] This wouldn't be a breaking change in existing TypeScript/JavaScript code
- [x] This wouldn't change the runtime behavior of existing JavaScript code
- [x] This could be implemented without emitting different JS based on the types of the expressions
- [x] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- [x] This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
- [x] This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

### ⭐ Suggestion

Now that #60052 allows for (some) computed properties in in `.d.ts` files I think the next step is for `--isolatedDeclaration` to be updated to not error and to emit the computed properties. Opening this issue if helpful to track this work.

I believe the previous plan (#58800) to introduce a new syntactic marker is no longer required.

Related issues: #58533 #60818 #61068

### 📃 Motivating Example

```ts
export const prop: unique symbol = Symbol();

export class MyClass {
[prop] = () => Math.random();
}
```

### `@isolatedDeclarations: false`

[playground](https://www.typescriptlang.org/play/?isolatedDeclarations=false&ts=5.8.3#code/PTAEAEEsGcHsBsCGAXApgEwCKoMZIE4qSwB20AXKAGaLzSoBQqAHgA6z7Kg6nRev5YrSgFcSkAI4jUoaAE8AtgCMEoALygAyopXwAFAEoA3AyZsOXPImjRQAWTkBhJDdABvBqC+gA2gKEAuuqghuoAfPYoABYAdIQk6LAKhiYAvgxAA)

```ts
export declare const prop: unique symbol;
export declare class MyClass {
[prop]: () => number;
}
```

### `@isolatedDeclarations: true` (current 🙁)

[playground](https://www.typescriptlang.org/play/?isolatedDeclarations=true&ts=5.8.3#code/PTAEAEEsGcHsBsCGAXApgEwCKoMZIE4qSwB20AXKMvgK6oBQqAHgA6z7Kg6nScv6wWlGiUgBHOqGgBPALYAjBKAC8oAMpzF8ABQBKANz1GrdpzyJo0UAFlpAYSSXQAb3qh3oANr9BAXRWgeioAfDYoABYAdIQk6LCyeoYAvvRAA)

```sh
ts(9038) Computed property names on class or object literals cannot be inferred with --isolatedDeclarations.
```

```ts
export declare const prop: unique symbol;
export declare class MyClass {
}
```

### `@isolatedDeclarations: true` (future 🚀 )

No error and same emit as `@isolatedDeclarations: false`

```ts
export declare const prop: unique symbol;
export declare class MyClass {
[prop]: () => number;
}
```

### 💻 Use Cases

The primary use case is enabling isolated declarations at scale on large codebases that make heavy use of computed properties.

Bắt đầu bằng cách tái hiện ví dụ thúc đẩy vấn đề với --isolatedDeclarations và xem xét các issue liên quan #60052, #58800, #58533, #60818 và #61068. Theo dõi cách xử lý declaration cô lập hiện có đối với các thuộc tính được tính toán; được xem là hoàn tất khi không có diagnostic nào và declaration emit giữ lại [prop] với kiểu trả về number của hàm.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.