Cleanup unused AlexaPercentageController code

[jbouwh]

Proposed change

• Cleanup some old code parts that were not cleaned up properly.
• Update the codeowners list

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)
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Additional information

• This PR fixes or closes issue: fixes #
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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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[bdraco]

From Discord discussion

Does this mean there is no way to set the fan to 50% ?
https://developer.amazon.com/en-US/docs/alexa/device-apis/alexa-percentagecontroller.html#utterances

jbouwh — Today at 10:51 AM
We use the range controller instead
At entities the capabilities are bound to an entity

[bdraco]

Test failure is unrelated. Its unmocked code in skybell

FAILED tests/components/skybell/test_config_flow.py::test_flow_user_unknown_error[pyloop] - Failed: Timeout >9.0s

cc @tkdrob

[frenck]

Thanks, @jbouwh 👍