AG-54563 implement ContentScriptManager

Squashed commit of the following:

commit be32e79
Author: Alexandr Zaitsev <a.zaitsev@adguard.com>
Date:   Thu Jun 25 16:51:48 2026 +0300

    Update TSURLFILTER_REF to point to feature/AG-54563

Author: Zauats

bamboo-specs/scripts/clone-tsurlfilter.sh

@@ -30,7 +30,7 @@ exec 2>&1
 #   TSURLFILTER_REF="v2.1.0"           # tag
 #   TSURLFILTER_REF=""                 # skip cloning
 
-TSURLFILTER_REF="release/browser-extension-v5.5"
+TSURLFILTER_REF="feature/AG-54563"
 
 # Repository URL
 # This should be set as a Bamboo project variable: tsurlfilterRepoUrl