fix: Add session_id Parameter to run_flow_from_json Function (#3989)

This pull request fixes the `run_flow_from_json` function by adding  `session_id` parameter. This update ensures that session management is properly handled during flow execution.

Changes include:
- Added `session_id` as an optional input parameter.
- Updated function documentation to reflect the inclusion of the new parameter.
- Added unit test for run_flow_from_json input parameters

This fix enhances the function's usability by allowing for better tracking of individual sessions.

src/frontend/src/modals/apiModal/utils/get-python-code.tsx

@@ -22,6 +22,7 @@ TWEAKS = ${tweaksString}
 
 result = run_flow_from_json(flow="${flowName}.json",
                             input_value="message",
+                            session_id="", # provide a session id if you want to use session state
                             fallback_to_env_vars=True, # False by default
                             tweaks=TWEAKS)`;
 }