Remove [no-mentions] handler in our triagebot config

https://github.blog/changelog/2025-11-07-removing-notifications-for-mentions-in-commit-messages/

Author: Urgau

src/tools/rust-analyzer/triagebot.toml

@@ -25,6 +25,3 @@ labels = ["has-merge-commits", "S-waiting-on-author"]
 
 # Canonicalize issue numbers to avoid closing the wrong issue when upstreaming this subtree
 [canonicalize-issue-links]
-
-# Prevents mentions in commits to avoid users being spammed
-[no-mentions]