chore: When processing pending tool confirmation requests, only look at events in the same branch

PiperOrigin-RevId: 816387687

Author: XinranTang

src/google/adk/flows/llm_flows/request_confirmation.py

@@ -48,7 +48,8 @@ async def run_async(
 
     agent = invocation_context.agent
 
-    events = invocation_context.session.events
+    # Only look at events in the current branch.
+    events = invocation_context._get_events(current_branch=True)
     if not events:
       return