Remove str as a valid HVACMode & HVACAction type

[frenck]

Proposed change

All integrations have migrated to use the new HVACMode & HVACAction enum instead of strings for HAVC modes. Therefore, the string typing can be removed.

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

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• This PR fixes or closes issue: fixes #
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[home-assistant]

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

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[frenck]

Manually rebased the PR to get rid of the merge that epenet did.

Ref: https://developers.home-assistant.io/docs/development_catching_up

[epenet]

LGTM 👍

[frenck]

Thanks, @epenet 👍

../Frenck