Error loading style from URL: string expected, array found

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**mapbox-gl-js version**: 3.9.2

**browser**: Electron (Chromium)

### Steps to Trigger Behavior

1. Fetch style from url: https://api.mapbox.com/styles/v1/mapbox/standard?access_token=pk.XXX
2. Create new mapbox with retrieved style object

```
fetch(`https://api.mapbox.com/styles/v1/mapbox/standard?access_token=${accessToken}`)
.then(r => r.json())
.then(style => {
const mapBox = new mapboxgl.Map({
accessToken,
container: 'mapbox-container',
style,
center: [0, 0],
interactive: false,
trackResize: false,
preserveDrawingBuffer: true,
performanceMetricsCollection: false
});
});
```

### Expected Behavior

The map should load correctly. This used to work correctly until recently, and is actually working well if I update mapbox-gl-js to the latest version, but for users that are stuck with an old version this has stopped working.

### Actual Behavior

The map fails to load. Something seems to have changed on the server side that breaks previously working versions.

```
Error: imports[0].data.sources.composite.promoteId.building: string expected, array found
at _emitValidationErrors (./node_modules/mapbox-gl/src/style/validate_style.ts:18:45)
at emitValidationErrors (./node_modules/mapbox-gl/src/style/style.ts:140:5)
at xo._load (./node_modules/mapbox-gl/src/style/style.ts:747:25)
at xo._load (./node_modules/mapbox-gl/src/style/style.ts:741:18)
at ./node_modules/mapbox-gl/src/style/style.ts:589:18
```

Reproduce the failure with mapbox-gl-js 3.9.2 and the fetched Standard style, then inspect the validation path in src/style/validate_style.ts and src/style/style.ts. Compare the promoteId.building value and validation behavior with a current version. Done means the reported style loads successfully for the affected older client, with coverage for the regression if the repository provides a suitable style-loading test.

Written by the indexing model from the issue text.