General: Restore and deprecate wp_register_development_scripts().

The function was removed in [61438] but should have been deprecated instead of removed outright, per WordPress backward compatibility policy.
Hot reloading is not used anymore in the latest Gutenberg build tool.

Props peterwilsoncc, westonruter.
See #64393.

git-svn-id: https://develop.svn.wordpress.org/trunk@61472 602fd350-edb4-49c9-b593-d223f7449a82
(cherry picked from commit 470fcfe)

Author: youknowriad

src/wp-includes/deprecated.php

@@ -6485,3 +6485,17 @@ function wp_print_auto_sizes_contain_css_fix() {
 	<style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style>
 	<?php
 }
+
+/**
+ * Registers development scripts that integrate with `@wordpress/scripts`.
+ *
+ * @see https://github.com/WordPress/gutenberg/tree/trunk/packages/scripts#start
+ *
+ * @since 6.0.0
+ * @deprecated 7.0.0 Obsolete due to a change in how Gutenberg is included in Core. See #64393.
+ *
+ * @param WP_Scripts $scripts WP_Scripts object.
+ */
+function wp_register_development_scripts( $scripts ) {
+	_deprecated_function( __FUNCTION__, '7.0.0' );
+}