Clean dyson climate tests

[MartinHjelmare]

Breaking change

Proposed change

• Move to async pytest standalone tests.
• Clean up.

Type of change

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

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[bdraco]

LGTM