Add in_stock_only parameter to /products endpoint

[seer-by-sentry]

👋 Hi there! This PR was automatically generated by Autofix 🤖

This fix was triggered by [email protected].

Fixes FLASK-38. The issue was that: TypeError occurred because product_inventory was None when in_stock_only was true, and code attempted membership check on None.

• Added get_all_inventory function to db.py to retrieve all inventory items from the database.
• Added in_stock_only parameter to the /products endpoint in main.py.
• If in_stock_only is true, only products with a count greater than 0 in the inventory are returned.
• If there is an error retrieving the inventory, an empty list is returned.

If you have any questions or feedback for the Sentry team about this fix, please email [email protected] with the Run ID: 43898.

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: flask/src/db.py

Function	Unhandled Issue
get_inventory	DatabaseConnectionError: get_inventory checkout Event Count: 17

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