Navigation: Preload API requests

When loading the Navigation screen, there are a lot of loading spinners due to API requests to `/menus` and `/menu-items`. We should preload these requests so that the screen appears faster. 

For reference, here's how `edit-site` does this:

https://github.com/WordPress/gutenberg/blob/f62d5ea0a308f58767dbcff051d1ff02af668f11/lib/edit-site-page.php#L153-L172

	// Preload block editor paths.
	// most of these are copied from edit-forms-blocks.php.
	$preload_paths = array(
	'/?context=edit',
	'/wp/v2/types?context=edit',
	'/wp/v2/taxonomies?context=edit',
	'/wp/v2/pages?context=edit',
	'/wp/v2/themes?status=active',
	array( '/wp/v2/media', 'OPTIONS' ),
	);
	$preload_data = array_reduce(
	$preload_paths,
	'rest_preload_api_request',
	array()
	);
	wp_add_inline_script(
	'wp-api-fetch',
	sprintf( 'wp.apiFetch.use( wp.apiFetch.createPreloadingMiddleware( %s ) );', wp_json_encode( $preload_data ) ),
	'after'
	);

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Navigation: Preload API requests #24642

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Navigation: Preload API requests #24642

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