Remove onEndSession prop from ProjectSessionDetailPage component

This change eliminates the `onEndSession` prop from the `ProjectSessionDetailPage` component, streamlining the code and ensuring consistency with recent updates that removed the associated functionality. This adjustment contributes to improved maintainability and clarity in the component's interface.

Author: Gkrumbach07

components/frontend/src/app/projects/[name]/sessions/[sessionName]/page.tsx

@@ -2243,7 +2243,6 @@ export default function ProjectSessionDetailPage({
                         setChatInput={setChatInput}
                         onSendChat={() => Promise.resolve(sendChat())}
                         onInterrupt={aguiInterrupt}
-                        onEndSession={() => Promise.resolve(handleEndSession())}
                         onGoToResults={() => {}}
                         onContinue={handleContinue}
                         workflowMetadata={workflowMetadata}