Modules API: Fix Interactivity not working on Classic Themes. (#57396)

* Move modules scripts to footer on classic themes

* Move only required modules

* Move also the module preloads

* Make preload only for block themes at head

* Revert "Make preload only for block themes at head"

This reverts commit 3edb69f.

lib/experimental/modules/class-gutenberg-modules.php

@@ -262,14 +262,15 @@ function gutenberg_dequeue_module( $module_identifier ) {
 	Gutenberg_Modules::dequeue( $module_identifier );
 }
 
-// Prints the import map in the head tag.
-add_action( 'wp_head', array( 'Gutenberg_Modules', 'print_import_map' ) );
+$modules_position = wp_is_block_theme() ? 'wp_head' : 'wp_footer';
+// Prints the import map in the head tag in block themes. Otherwise in the footer.
+add_action( $modules_position, array( 'Gutenberg_Modules', 'print_import_map' ) );
 
-// Prints the enqueued modules in the head tag.
-add_action( 'wp_head', array( 'Gutenberg_Modules', 'print_enqueued_modules' ) );
+// Prints the enqueued modules in the head tag in block themes. Otherwise in the footer.
+add_action( $modules_position, array( 'Gutenberg_Modules', 'print_enqueued_modules' ) );
 
-// Prints the preloaded modules in the head tag.
-add_action( 'wp_head', array( 'Gutenberg_Modules', 'print_module_preloads' ) );
+// Prints the preloaded modules in the head tag in block themes. Otherwise in the footer.
+add_action( $modules_position, array( 'Gutenberg_Modules', 'print_module_preloads' ) );
 
 // Prints the script that loads the import map polyfill in the footer.
 add_action( 'wp_footer', array( 'Gutenberg_Modules', 'print_import_map_polyfill' ), 11 );