Remove deprecated attributes from Swiss public transport integration

[miaucl]

Breaking change

Swiss public transport does not provide additional fields anymore, but moved all information to individual sensors since the setup of the new config_flow.

Proposed change

This information was used for the old yaml setup, where it only had a single sensor, but since the integration of the config flow in 2023.12.0 and the removal of this setup method in 2024.6.0 (#119813), this information is now available only as sensor data, which is the preferred method of Home Assistant.

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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[home-assistant]

Hey there @fabaff, mind taking a look at this pull request as it has been labeled with an integration (swiss_public_transport) you are listed as a code owner for? Thanks!

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[edenhaus]

Thanks @miaucl 👍