Adjust duplicate handling in xpath scraper

[jkt260037]

To improve scraper flexibility by allowing duplicates when needed.
For example, for //a/@data-gender, the result should be ['male', 'female', 'female'] instead of ['male', 'female'].

<a href="/test1" data-gender="male">A</p>
<a href="/test2" data-gender="female">B</p>
<a href="/test3" data-gender="female">C</p>