Completion does not work for generic type extending tuple or array of all partial type

还没有人认领这个 Issue。

### Extension Version

0.20251202.1

### VS Code Version

1.103.2

### Operating system Version

Linux Mint 22.2 Zara

### Steps to reproduce

1. Paste the following code into VS Code.
2. In each example, type com... and check whether it is auto-completed.

### Issue

```ts
// All partial type works

type AllPartialObject = {
component?: string
}

declare function extendTheme1(
extensions: Extensions
): void

extendTheme1([
{
/* Can autocomplete `component` here */
},
])

// But all partial type with mapped types doesn't work

declare function extendTheme2<
Extensions extends [AllPartialObject & Record],
>(extensions: Extensions): void

extendTheme2([
{
/* Can't autocomplete `component` here */
},
])

// with required field works

type PartialWithRequiredObject = {
component?: string
requiredField: string
}

declare function extendTheme3<
Extensions extends [PartialWithRequiredObject & Record],
>(extensions: Extensions): void

extendTheme3([
{
/* Can autocomplete `component` here */
},
])

// but with required field and complete required field doesn't work

extendTheme3([
{
requiredField: 'foo',
/* Can't autocomplete `component` here */
},
])

// also BaseTheme with no mapped types doesn't work too

declare function extendTheme4(
extensions: Extensions
): Extensions

extendTheme4([
{
requiredField: 'foo',
/* Can't autocomplete `component` here */
},
])

// no extend tuple works

declare function extendTheme5<
Extensions extends AllPartialObject & Record,
>(extensions: [Extensions]): Extensions

extendTheme5([
{
/* Can autocomplete `component` here */
},
])
```

Original issue: https://github.com/microsoft/TypeScript/issues/45617

首先，使用 issue 中的 TypeScript 示例，在 VS Code 中复现 extendTheme1 到 extendTheme5 之间的补全差异，然后将其行为与链接的原始 issue 进行比较。当组件补全出现在当前失败的泛型元组和映射类型场景中，且不会导致正常工作的示例出现回归时，即视为完成。

由索引模型根据 Issue 内容生成。