feat: optionally exclude collection documents from appearing in browse-by-folder (#12654)

Adds configurations for browse-by-folder document results. This PR
**does NOT** allow for filtering out folders on a per collection basis.
That will be addressed in a future PR 👍

### Disable browse-by-folder all together
```ts
type RootFoldersConfiguration = {
  /**
   * If true, the browse by folder view will be enabled
   *
   * @default true
   */
  browseByFolder?: boolean
  // ...rest of type
}
```

### Remove document types from appearing in the browse by folder view
```ts
type CollectionFoldersConfiguration =
  | boolean
  | {
      /**
       * If true, the collection documents will be included in the browse by folder view
       *
       * @default true
       */
      browseByFolder?: boolean
    }
```

### Misc
Fixes https://github.com/payloadcms/payload/issues/12631 where adding
folders.collectionOverrides was being set on the client config - it
should be omitted.

Fixes an issue where `baseListFilters` were not being respected.

test/folders-browse-by-disabled/shared.ts

@@ -0,0 +1 @@
+export const postSlug = 'posts'