Add DFRobot Firebeetle2 ESP32-C6 board

[epsilonrt]

This commit introduces initial support for the
DFRobot Firebeetle2 ESP32-C6 board, including its
configuration file.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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