[Bug]: Select/Multiselect fields accept invalid data

### Pimcore version

11.3.0

### Steps to reproduce

1. Create a Select/Multiselect field in a class with options "A", "B", and "C".
2. Create an object via the PHP API (e.g., a command) and set its value to "D".

### Actual Behavior

Pimcore accepts this value and saves it in the object.

### Expected Behavior

Pimcore should throw a ValidationException.