feat(cdp): convert snapchat to server-side mappings + node

[MarconLP]

Changes

Before

After

• move server-side template to node
• convert the server-side snapchat template to use mappings
• adjust to our e-commerce spec
• use arrayReduce function to calculate num_items

todos:

• merge feat(cdp): support mapping tests #31047

Does this work well for both Cloud and self-hosted?

How did you test this code?

[greptile-apps]

PR Summary

This PR moves the Snapchat Ads server-side template from Python to Node.js and converts it to use mappings, aligning with PostHog's e-commerce event specification.

• Added comprehensive test suite in snapchat.template.test.ts covering single/multi-product events, error handling, and sensitive data hashing
• Implemented proper event mapping between PostHog and Snapchat events (e.g., "Order Completed" → "PURCHASE")
• Added support for multi-product events using arrayMap and arrayReduce functions to process product arrays
• Removed Python implementation (template_snapchat_ads.py and its tests) while maintaining the Snapchat Pixel client-side template
• Added the new Node.js template to the destinations list in plugin-server/src/cdp/templates/index.ts

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