FirebaseOptions interface has all of its properties set to optional

### Operating System

macOS

### Browser Version

Safari 16.5.2

### Firebase SDK Version

10.1.0

### Firebase SDK Product:

Auth

### Describe your project's tooling

index.html with source tag.

### Describe the problem

I am talking about this interface

```
export interface FirebaseOptions {
apiKey?: string;
authDomain?: string;
databaseURL?: string;
projectId?: string;
storageBucket?: string;
messagingSenderId?: string;
appId?: string;
measurementId?: string;
}
```

All of the properties are optional, however from the docs only `measurementId` should be.

### Steps and code to reproduce issue

See [https://firebase.google.com/docs/reference/js/app.firebaseoptions](https://firebase.google.com/docs/reference/js/app.firebaseoptions).

Start by locating the exported FirebaseOptions interface shown in the issue and compare its property optionality with the FirebaseOptions reference documentation. Verify the expected required and optional properties against the public type and run the relevant TypeScript checks; done means the interface and documented contract agree.

Written by the indexing model from the issue text.