Clean title come from meta tags

[cikay]

Apply HTMLTITLE_REGEX cleanup to titles extracted from og:title, twitter:title, meta name title, and itemprop headline. Previously, extract() with with_metadata=True returned titles with site name suffixes from meta tags, while extract_title() correctly returned clean titles from h1 tags.

• Add clean_title() helper function to remove site name suffix/prefix
• Apply clean_title() in extract_opengraph() for og:title
• Apply clean_title() in examine_meta() for meta name titles and itemprop headlines
• Add tests for clean_title() and title cleaning in metadata extraction

The issue is encountered in the following website
https://www.nuhev.com

example url: https://www.nuhev.com/gelo-jiyan-de-li-sala-2050yan-cawa-be/

titles from meta: <meta property="og:title" content="Gelo Jîyan dê li Sala 2050yan Çawa Be? - Nûhev Co. %100 Kurdî">
titles from h1: <h1 class="jeg_post_title">Gelo Jîyan dê li Sala 2050yan Çawa Be?</h1>