Fix invalid alexa climate or water_heater state report with double listed targetSetpoint

[jbouwh]

Proposed change

Fixes a regression where in some cases the targetSetpoint was added twice to the state report.
Add an extra check to the common test assert_equal to avoid this in the future.

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 Alexa - Climate device is unresponsive. #107475
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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[home-assistant]

Hey there @home-assistant/cloud, @ochlocracy, mind taking a look at this pull request as it has been labeled with an integration (alexa) you are listed as a code owner for? Thanks!

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[jpbede]

Looks good, thanks @jbouwh 👍