Quick/Bulk Edit: Add an action hook on bulk_edit_posts().

This changeset introduces the `bulk_edit_posts` action hook, triggered after processing the post data for bulk edit and before it returns its results. For example, it allows developers to save additional data without having to perform any `.ajax()` call.

Props helgatheviking, helen, Mte90, afercia, mrasharirfan, desrosj, itowhid06, pento, mensmaximus, audrasjb, costdev.
Fixes #28112.

Built from https://develop.svn.wordpress.org/trunk@55108


git-svn-id: http://core.svn.wordpress.org/trunk@54641 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/post.php

@@ -663,6 +663,15 @@ function bulk_edit_posts( $post_data = null ) {
 		}
 	}
 
+	/**
+	 * Fires after processing the post data for bulk edit.
+	 *
+	 * @since 6.2.0
+	 *
+	 * @param array $post_data Associative array containing the post data.
+	 */
+	do_action( 'bulk_edit_posts', $post_data );
+
 	return array(
 		'updated' => $updated,
 		'skipped' => $skipped,