[Navigation] enqueue_block_editor_assets action is not fired

[manmotive]

Describe the bug
I am attempting to follow this guide to add a button to the menu item toolbar:

https://developer.wordpress.org/block-editor/tutorials/format-api/1-register-format/

It appears that the "enqueue_block_editor_assets" action is not fired on the /wp-admin/admin.php?page=gutenberg-navigation page.

To reproduce

1. Add the following to a plugin or your theme:

function my_custom_format_enqueue_assets_editor() {
    die("got here");
}
add_action( 'enqueue_block_editor_assets', 'my_custom_format_enqueue_assets_editor' );

2. Visit /wp-admin/admin.php?page=gutenberg-navigation

Expected behavior
I would expect to see the message "got here", but I do not as the action is not fired on the new Navigation page. If I edit a page or post I see the "got here" message.

Editor version:

• WordPress version: 5.4
• Does the website has Gutenberg plugin installed, or is it using the block editor that comes by default? Gutenberg plugin
• If the Gutenberg plugin is installed, which version is it? 7.9

[noisysocks]

Possibly related to #25826.

We likely need to add this code which is on widgets-page.php to navigation-page.php as well:

gutenberg/lib/widgets-page.php

Lines 136 to 144 in 7f1fac9

	function gutenberg_widgets_editor_load_block_editor_scripts_and_styles( $is_block_editor_screen ) {
	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
	return true;
	}
	return $is_block_editor_screen;
	}
	add_filter( 'should_load_block_editor_scripts_and_styles', 'gutenberg_widgets_editor_load_block_editor_scripts_and_styles' );