Plugins: Tweak the plugin icons added in [41695].

- Remove plugins icons from the plugin list table, as there were performance issues loading the icons when the site had lots of plugins.
- Depending on which icons the plugin has uploaded, prefer them in this order: `svg`, `128x128`, `256x256`.
- Improve the style of the fallback icon for plugins that don't have an icon defined.

Props Travel_girl, danieltj, afercia, karmatosed,hugobaeta, empireoflight, brentjett, melchoyce, pento.
Fixes #30186.



git-svn-id: https://develop.svn.wordpress.org/trunk@41755 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-plugins-list-table.php

@@ -751,17 +751,9 @@ class WP_Plugins_List_Table extends WP_List_Table {
 					echo "<th scope='row' class='check-column'>$checkbox</th>";
 					break;
 				case 'name':
-					$icon = '<span class="dashicons dashicons-admin-plugins"></span>';
-					if ( ! empty( $plugin_data['icons']['default'] ) ) {
-						$icon = '<img src="' . esc_url( $plugin_data['icons']['default'] ) . '" alt="" />';
-					}
-					?>
-					<td class="plugin-title column-primary">
-						<?php echo $icon; ?>
-						<strong><?php echo $plugin_name; ?></strong>
-						<?php echo $this->row_actions( $actions, true ); ?>
-					</td>
-					<?php
+					echo "<td class='plugin-title column-primary'><strong>$plugin_name</strong>";
+					echo $this->row_actions( $actions, true );
+					echo "</td>";
 					break;
 				case 'description':
 					$classes = 'column-description desc';