Signals Notebook: How to properly obtain worksheet embedded grid IDs over the API

Description

When performing a GET /worksheet/{eid} on a worksheet that has embedded grids, do not use the embeddedEID values found on the worksheet response as a way to identify embedded grids. 

The children endpoint provides the correct ADT EIDs. 

Solution

- Do not use embeddedEIDs from the worksheet content response (GET /worksheet/{worksheetEID} to identify ADTs.
- Use GET /entities/{worksheetEID}/children to retrieve child ADTs and their EIDs (type grid).
- For downstream integrations (e.g., data lakes), standardize on grid EIDs from /children as the authoritative identifiers.