Hide rpi_power entry during onboarding

[MartinHjelmare]

Breaking change

Proposed change

• Hide the rpi_power integration entry during onboarding.
• Requires Add rpi_power during onboarding on RPi core#40076

Type of change

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Add rpi_power during onboarding on RPi core#40076
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[MartinHjelmare]

I have only tested the negative case where we're not on an RPi. That still works. The backend was tested on an RPi with the production frontend.

[MartinHjelmare]

Backend PR has been merged.