Upgrade/Install: Initialize plugin dependencies during ajax plugin search.

This ensures that a plugin's "Deactivate" link is disabled for dependency plugins during searches when a dependent plugin is active. It also ensures the "Requires" metadata is shown for dependent plugins, and the "Required by" metadata is shown for dependency plugins. 

Developed in #10547

Follow-up to [57545].

Props hbhalodia, webdados, swissspidy, ravichudasama01.
See #22316.
Fixes #64288.


git-svn-id: https://develop.svn.wordpress.org/trunk@61312 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-admin/includes/ajax-actions.php

@@ -4804,6 +4804,8 @@ function wp_ajax_search_plugins() {
 	// Ensure after_plugin_row_{$plugin_file} gets hooked.
 	wp_plugin_update_rows();
 
+	WP_Plugin_Dependencies::initialize();
+
 	$pagenow = isset( $_POST['pagenow'] ) ? sanitize_key( $_POST['pagenow'] ) : '';
 	if ( 'plugins-network' === $pagenow || 'plugins' === $pagenow ) {
 		set_current_screen( $pagenow );