PHP 8.4 | Exit as function: fix incorrect parameter name (#15433)

Follow up on 13483

As previously reported in https://github.com/php/php-src/pull/13483#discussion_r1718546927:

PHP 8.4 | Exit as function: fix incorrect parameter name (#15433)

Follow up on 13483

As previously reported in https://github.com/php/php-src/pull/13483#discussion_r1718546927:

> The parameter names seem to be incorrect.
>
> It should be `$status`, not `$code`.
>
> The RFC explicitly uses that parameter name in the proposal: https://wiki.php.net/rfc/exit-as-function#proposal
>
> It is also the name already used in the [manual](https://www.php.net/exit).
>
> Lastly, the parameter name `$status` better covers what can be passed: either a status _message_ or a status _code_.
> While `$code` would read pretty weird when passing a message:
> ```php
> exit(code: 'message');
> ```

This commit attempts to fix this.

Includes adding a test for exit/die using a named argument.

Co-authored-by: jrfnl <jrfnl@users.noreply.github.com>

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exit_as_funtion RFC follow-up: ensure default INI settings used in status test (#15420)

[RFC] Convert exit (and die) from language constructs to functions (#13483)

RFC: https://wiki.php.net/rfc/exit-as-function