Proposed change

When configuring Zigbee or Thread firmware, we currently rely on addons to install the correct firmware type either explicitly (in the case of the Silicon Labs Flasher addon) or implicitly on startup (in the case of the OpenThread addon). These addons often do not bundle the latest firmware for the adapter and are set to auto-install firmware on startup, preventing Core from installing firmware updates.

We already use the universal-silabs-flasher package to install firmware updates. This PR replaces firmware flashing using addons with firmware flashing using the aforementioned package.

Unblocks home-assistant/addons#4017.

Demo

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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