mysqli: Deprecate mysqli_execute() (#19286)

RFC: https://wiki.php.net/rfc/deprecations_php_8_5#formally_deprecate_mysqli_execute

Author: TimWolla

ext/mysqli/mysqli.stub.php

@@ -1383,6 +1383,7 @@ function mysqli_error_list(mysqli $mysql): array {}
 function mysqli_stmt_execute(mysqli_stmt $statement, ?array $params = null): bool {}
 
 /** @alias mysqli_stmt_execute */
+#[\Deprecated(since: '8.5', message: "use mysqli_stmt_execute() instead")]
 function mysqli_execute(mysqli_stmt $statement, ?array $params = null): bool {}
 
 function mysqli_execute_query(mysqli $mysql, string $query, ?array $params = null): mysqli_result|bool {}