Added logs data flow diagram

Split based on feedback from here
https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/359

Click Here to see Doc to Review:
https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/BBOI-521_logs_diagram/docs/understanding/logs_data_flow_diagram.md