fix(app): add add'l shopify webhook sync handlers

[beelaineo]

Sync handlers for:

• productDelete
• productCreate
• collectionCreate
• collectionUpdate
• collectionDelete

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
spinellikilcollin	✅ Ready (Inspect)	Visit Preview	Sep 4, 2024 0:40am

[notion-workspace[bot]]

Collection Publishing Errors

[notion-workspace[bot]]

Inventory Bug: Shopify Product and Collection Webhooks (sync fixes)