[PikabuBridge] Skip sponsored posts (#2983)

* [PikabuBridge] Skip sponsored posts

Sponsored posts appear very rarely in html code.
But when they appear, they always have different url that results junk feed.

One of the example is [1]. After visiting it, you will be redirected to [2] that is marked as
"Партнёрский материал" in Russian, or "Sponsored post" in English.

[1] https://pikabu.ru/story/a_mla_posa_m_memu_seyla_otorathche_idomikhlenonoikhmyav_sseyla_otoratazoed__9388770?from=cpm
[2] https://pikabu.ru/story/kakim_dolzhen_byit_vash_noutbuk_9388770

* lint

Co-authored-by: Dag <me@dvikan.no>

bridges/PikabuBridge.php

@@ -132,6 +132,10 @@ class PikabuBridge extends BridgeAbstract
             }
 
             $title_element = $post->find('.story__title-link', 0);
+            if (str_contains($title_element->href, 'from=cpm')) {
+                // skip sponsored posts
+                continue;
+            }
 
             $title = $title_element->plaintext;
             $community_link = $post->find('.story__community-link', 0);