fix: Improve cache handling in getDevicesAndBrowsers

[tech-sushant]

No description provided.

[Copilot]

Pull Request Overview

This PR improves cache handling in the getDevicesAndBrowsers function by implementing per-product TTL checking and better error handling. The changes move from a file-level TTL to individual product-level TTL tracking and enhance cache data structure.

• Implements per-product cache TTL instead of file-level TTL
• Improves error handling for cache file parsing
• Enhances cache data structure to include timestamps per product

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