custom_sdkconfig is already set in boards manifest

[Jason2866]

no need to set in arduino.py

Checklist:

• The pull request is done against the latest develop branch
• Only relevant files were touched
• Only one feature/fix was added per PR, more changes are allowed when changing boards.json
• I accept the CLA

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch only_board_entry

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