[CONNECT][PYTHON] Session not found error should automatically retry during reattach

When an OPERATION_NOT_FOUND error is raised and no prior responses were received, the client retries the ExecutePlan RPC: https://github.com/apache/spark/blob/e6217c111fbdd73f202400494c42091e93d3041f/python/pyspark/sql/connect/client/reattach.py#L257

Another error SESSION_NOT_FOUND should follow the same logic.