Pydantic warnings raised in dsh config template

[JimMadge]

When running dsh config template Pydantic raises warnings as some "help strings" are not expected types,

❯ dsh config template > config.yaml
/Users/jmadge/Library/Application Support/hatch/env/virtual/data-safe-haven/R3_ZGVTw/data-safe-haven/lib/python3.12/site-packages/pydantic/main.py:328: UserWarning: Pydantic serializer warnings:
  Expected `enum` but got `str` - serialized value may not be as expected
  Expected `bool` but got `str` - serialized value may not be as expected
  Expected `bool` but got `str` - serialized value may not be as expected
  return self.__pydantic_serializer__.to_python(

We could,

• suppress the warnings
• use the expected types then add comments another way