Command Palette: Add network admin check

To prevent the registration of commands that would cause a 404 error in the network admin screen, pass the result of the `is_network_admin()` check to the command palette initialization function.

Follow-up to [61022].

Props jorbin, ntsekouras, soean, tobiasbg
Fixes #64125.

git-svn-id: https://develop.svn.wordpress.org/trunk@61121 602fd350-edb4-49c9-b593-d223f7449a82

Author: t-hamano

src/wp-includes/script-loader.php

@@ -3430,7 +3430,9 @@ function wp_enqueue_classic_theme_styles() {
 function wp_enqueue_command_palette_assets() {
 	global $menu, $submenu;
 
-	$command_palette_settings = array();
+	$command_palette_settings = array(
+		'is_network_admin' => is_network_admin(),
+	);
 
 	if ( $menu ) {
 		$menu_commands = array();