Fix and update firmware download

[cl445]

Fix and update firmware download process with error handling, logging, and file validation

Details:

• Download firmware from master branch: Retrieve firmware files directly from the master branch on GitHub for consistency and updates.
• Implement robust error handling: Catch potential exceptions during download, extraction, and file operations to prevent unexpected failures and provide informative error messages.
• Integrate logging: Use the Log facade to track progress, status, and potential errors for easier debugging and monitoring.
• Add file validation: Verify the downloaded file size and content to ensure integrity and prevent issues with empty or invalid files.
• Extract specific subfolders: Extract only firmware files within latest and feature-specific subfolders for targeted updates.
• Improve code readability: Enhance code clarity with better variable naming, comments, and formatting for easier maintenance.

[jacobsvante]

Thanks for this!

For me there were two things I had to do to get your PR working:

1. Delete file /var/lib/cmprovision/storage/app/firmware/latest, as your code wants to read that as a directory
2. After fetching latest firmware from UI, I had to move pieeprom- files from newly created /var/lib/cmprovision/storage/app/firmware/latest directory into it's child directory var/lib/cmprovision/storage/app/firmware/stable. After that the firmware was visible under EEPROM firmware update to apply.

[cl445]

My PR is now open for more than 2 years. I am glad that it was actualy usefull for someone. Thanks! 🙂