Update CreateCAPProject notebook for CDS 9.x

[priyankasaraf-111]

Summary

• Use cds init --add nodejs to generate a package.json with @sap/cds as a declared dependency (CDS 9 best practice)
• Add npm install after init so the project is self-contained
• Fix conversation CSV filename: sap.capire.incidents-Incidents.conversation.csv (CDS 9.x renames composition tables to include the parent entity name; old name sap.capire.incidents-conversation.csv would silently not load)

Test plan

• Run all cells in the notebook — project initializes and installs cleanly
• cds watch starts without errors
• Conversation data loads correctly in the running service

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