[php-src] Issue #21705: `ZipArchive::getFromIndex()` ignores `ZipArchive::FL_UNCHANGED` for deleted entries

Issue: https://github.com/php/php-src/issues/21705
Author: LamentXU123

### Description

The following code:

```php
<?php
$name = __DIR__ . '/test.zip';
@unlink($name);
$zip = new ZipArchive;
$zip->open($name, ZipArchive::CREATE);
$zip->addFromString('foo.txt', 'foo');
$zip->addFromString('bar.txt', 'bar');
$zip->close();

$zip = new ZipArchive;
$zip->open($name);

$index = $zip->locateName('bar.txt');
$zip->deleteName('bar.txt');

var_dump($zip->getFromName('bar.txt', 0, ZipArchive::FL_UNCHANGED));
var_dump($zip->getFromIndex($index, 0, ZipArchive::FL_UNCHANGED));

$zip->close();
@unlink($name);
?>
```

Resulted in this output:
```
string(3) "bar"
bool(false)
```

But I expected this output instead:
```
string(3) "bar"
string(3) "bar"
```

Seems like `ZipArchive::getFromIndex()` accepts a `$flags` argument, but in `ext/zip/php_zip.c` the index lookup path does not pass those flags to `zip_stat_index()`. `getFromName()` works, but `getFromIndex()` does not honor FL_UNCHANGED.

### PHP Version

```plain
all supported version
```

### Operating System

_No response_