Add additional overrides to cover entity in Overkiz

[iMicknl]

Proposed change

Based on the available UIWidgets, adding additional overrides for the "withPedestrianPosition" devices. Add tilt support to the Roller Shutter.

Unfortunately I haven't been able to find device fixtures for these specific devices, but they are very similar to previous implementations / bugfixes after the large cover entity rewrite.

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 #
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Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

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[Copilot]

Pull request overview

Adds Overkiz cover entity descriptions for three additional gate widgets that report core:OpenClosedPedestrianState (so they need the same override as the existing OPEN_CLOSE_PEDESTRIAN_GATE), and adds tilt (slate orientation) support to the generic ROLLER_SHUTTER description.

Changes:

• Add OverkizCoverDescription overrides for OPEN_CLOSE_GATE_WITH_PEDESTRIAN_POSITION, OPEN_CLOSE_SLIDING_GATE_WITH_PEDESTRIAN_POSITION, and POSITIONABLE_GATE_WITH_PEDESTRIAN_POSITION widgets (Gate device class, pedestrian closed-state).
• Include current_position_state/set_position_command for the positionable variant only.
• Extend the UIClass.ROLLER_SHUTTER description with current_tilt_position_state, set_tilt_position_command, and stop_tilt_command (gated at runtime by executor.has_command).