Support offset on input_datetime time trigger

[karwosts]

Proposed change

Show offset field for input_datetime entities. For home-assistant/core#131550

Also this removes time entities from the entity selector, as they don't seem to have actually ever been supported (backend just returns an error). Seems like they were added there by mistake.

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 or discussion:
• 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

[silamon]

That's true, it's still on my list to implement it after we found out it is missing.