[php-src] Issue #22583: Return INT value for some disk_* operations

Issue: https://github.com/php/php-src/issues/22583
Author: KarelWintersky

### Description

Currently (and for who knows how many years), a number of functions responsible for working with the file system return float values ​​instead of integers.

Does this seem confusing? A fractional number of bytes? How so?

One might assume that in the days of the 32-bit PHP, the integer type wasn't large enough to accommodate the possible disk sizes of the time, but in 2026, this seems absurd. Not to mention that comparing floating-point numbers is an ambiguous operation.

Functions that return float values ​​instead of integers are:

- https://www.php.net/manual/en/function.disk-free-space.php
- https://www.php.net/manual/en/function.disk-total-space.php

P.S. 

The behavior looks especially strange considering that the function `filesize` returns an integer value...