Add display of combined dataframe for backtesting uploads in app.py

- Introduced a new dataframe display for entries labeled 'Backtesting_upload' to enhance visibility of relevant data after portfolio and contest concatenation. This improves user experience by providing immediate access to specific upload results.

app.py

@@ -214,6 +214,7 @@ with tab1:
                 st.dataframe(st.session_state['portfolio_df'].head(25))
                 st.session_state['combined_df'] = pd.concat([st.session_state['Contest'], st.session_state['portfolio_df']], ignore_index=True)
                 st.session_state['combined_df'] = st.session_state['combined_df'].reset_index(drop=True)
+                st.dataframe(st.session_state['combined_df'][st.session_state['combined_df']['BaseName'] == 'Backtesting_upload'].head(25))
                 st.session_state['entry_list'].append('Backtesting_upload')
             else:
                 pass