[BUG] Value type DateYYYYMMDD is published twice

## Steps to reproduce
1. Use the valuetype `DateYYYYMMDD` in a model

## Description
- Expected: Works
- Actual: `An error occurred during validation: Error! The input value was not handled.`

## Notes
Defined in ./libs/language-server/src/stdlib/domain/material-science/MaterialScienceValueTypes.jv and ./libs/language-server/src/stdlib/domain/mobility/GTFSValueTypes.jv
