Comment out discord CL (#24734)

Until publish runs work.

(cherry picked from commit 117399d91403b6bb17035c2a1624790d90dca529)

Tools/actions_changelogs_since_last_run.py

@@ -129,6 +129,9 @@ def send_to_discord(entries: Iterable[ChangelogEntry]) -> None:
     if not DISCORD_WEBHOOK_URL:
         print(f"No discord webhook URL found, skipping discord send")
         return
+    
+    # Temporary until github publishing working to avoid spamming cl
+    return
 
     message_content = io.StringIO()
     # We need to manually split messages to avoid discord's character limit