Posts, Post Types: Add pre_post_insert action hook before inserting a new post.

This changeset adds a `pre_post_insert` action hook before inserting a new post via `wp_insert_post()`, allowing developers to modify or inspect post data before insertion. It brings consistency with the `pre_post_update` action hook triggered when a post is updated.

Props Hrohh, peterwilsoncc, audrasjb.
Fixes #63115.



git-svn-id: https://develop.svn.wordpress.org/trunk@60293 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-includes/post.php

@@ -4874,6 +4874,15 @@ function wp_insert_post( $postarr, $wp_error = false, $fire_after_hooks = true )
 			}
 		}
 
+		/**
+		 * Fires immediately before a new post is inserted in the database.
+		 *
+		 * @since 6.9.0
+		 *
+		 * @param array $data Array of unslashed post data.
+		 */
+		do_action( 'pre_post_insert', $data );
+
 		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
 			if ( $wp_error ) {
 				if ( 'attachment' === $post_type ) {