Fix CalDAV supported components check when configured from the UI

[allenporter]

Proposed change

Share the check for supported components when configured from yaml or UI. The yaml setup flow has been converted to async to make it easier to share. This will also be used in the todo component, so the check is moved to a util library shared by multiple components.

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 #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[allenporter]

I changed one more thing in the new code location, making the return value a list comprehension.

[MartinHjelmare]

Thanks!