Passing xpath to XmlStructure::matchElement() always throws Exception

The signature allows param `$cssOrXpath`: https://github.com/Codeception/lib-xml/blob/main/src/Util/XmlStructure.php#L37
But when an xpath is passed, it will throw an exception.

This is broken since Codeception 5.0:
- v4 used to catch parser exceptions, and then continues to try an xpath: https://github.com/Codeception/Codeception/blob/4.2.2/src/Codeception/Util/XmlStructure.php#L39-L46
- v5 does not: https://github.com/Codeception/lib-xml/blob/main/src/Util/XmlStructure.php#L40

## Reproduce

- Create a unit test and pass an xpath, for example through Codeceptions SOAP module `grabTextContentFrom()` (https://codeception.com/docs/modules/SOAP#grabTextContentFrom):
```
$xpath = '/example';
$I->grabTextContentFrom($xpath))
```
- Run the test. Output:
```
1) ExampleCest: Call undefined operation
Test ExampleCest.php:example

[Symfony\Component\CssSelector\Exception\SyntaxErrorException] Expected selector, but found.

Scenario Steps:

4. $I->grabTextContentFrom("/example") at (..)

#1 (..)\vendor\symfony\css-selector\Exception\SyntaxErrorException.php:28
#2 (..)\vendor\symfony\css-selector\Parser\Parser.php:284
#3 (..)\vendor\symfony\css-selector\Parser\Parser.php:115
#4 (..)\vendor\symfony\css-selector\Parser\Parser.php:100
#5 (..)\vendor\symfony\css-selector\Parser\Parser.php:42
#6 (..)\vendor\symfony\css-selector\XPath\Translator.php:222
#7 (..)\vendor\symfony\css-selector\XPath\Translator.php:92
#8 (..)\vendor\symfony\css-selector\CssSelectorConverter.php:65
#9 Codeception\Module\SOAP->grabTextContentFrom
```

## Possible fix

Re-implement the try-catch:
```php
public function matchElement(string $cssOrXPath): ?DOMNode
{
$domXpath = new DOMXpath($this->xml);
try {
$selector = (new CssSelectorConverter())->toXPath($cssOrXPath);
$els = $domXpath->query($selector);
if ($els !== false && count($els) > 0) {
return $els->item(0);
}
} catch (\Symfony\Component\CssSelector\Exception\ParseException $e) {
}
$els = $domXpath->query($cssOrXPath);
if ($els !== false && count($els) > 0) {
return $els->item(0);
}
throw new ElementNotFound($cssOrXPath);
}
```

閱讀 src/Util/XmlStructure.php 和 SOAP 模組的 grabTextContentFrom() 路徑，然後建立一個重現類似 /example 的 XPath 的單元測試。完成標準是 XPath 不再引發 CSS selector exception，並回傳符合的元素。

由索引模型根據 Issue 內容生成。