Replace static success message with setup verification query

[krisajenkins]

Problem

Users frequently paste the setup script into the Snowflake UI and click "Run" instead of "Run All". This causes only the final statement to execute, which was previously a static success message:

select 'Congratulations! Snowflake Data Engineering workshop setup has completed successfully!' as status;

This gave users a false sense of success even though none of the actual setup (warehouse, databases, tables, functions) had been created.

Solution

Replace the static message with a verification query that checks whether the setup actually completed:

• Verifies current database is set to RAW_DB
• Checks that the CUSTOMERS table exists and has data
• Checks that the PRODUCTS table exists and has data
• Checks that the ORDERS table exists and has data

The query now reports:

• ✓ 4/4 checks passed. Setup successful! when everything is properly configured
• ✗ X/4 checks passed. Setup incomplete - please click "Run All" to execute the entire script. when setup is incomplete

Test Plan

• Paste script into Snowflake UI and click "Run" (not "Run All") - should show failure message with reminder
• Click "Run All" on the full script - should show success message with 4/4 checks passed