Taxonomy: Introduce the is_term_publicly_viewable() function.

This is the taxonomy term counterpart to the `is_post_publicly_viewable()` function. Although the logic for terms is more straight forward this serves the same purpose as introducing the corresponding function for posts -- to centralise and reduce the logic needed to validate a term and determine if it's publicly viewable.

Props peterwilsoncc, costdev, johnbillion

Fixes #56215


git-svn-id: https://develop.svn.wordpress.org/trunk@53893 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -460,7 +460,6 @@ class WP_Terms_List_Table extends WP_List_Table {
 		// Restores the more descriptive, specific name for use within this method.
 		$tag      = $item;
 		$taxonomy = $this->screen->taxonomy;
-		$tax      = get_taxonomy( $taxonomy );
 		$uri      = wp_doing_ajax() ? wp_get_referer() : $_SERVER['REQUEST_URI'];
 
 		$edit_link = add_query_arg(
@@ -497,7 +496,7 @@ class WP_Terms_List_Table extends WP_List_Table {
 			);
 		}
 
-		if ( is_taxonomy_viewable( $tax ) ) {
+		if ( is_term_publicly_viewable( $tag ) ) {
 			$actions['view'] = sprintf(
 				'<a href="%s" aria-label="%s">%s</a>',
 				get_term_link( $tag ),