🌱 Refactor FilterSelectOptionProps (#1802)

[ibolton336]

Key points:

1. do not extend PF SelectOptionProps interface - this allows to add
   custom props to the interface and provides better control what prop
   are forwarded to SelectOption
2. remove key prop as it's a special prop used internally by React
3. use value prop according to PF documentation - effectively replace
   previously used key prop
4. add label prop - to be used as human friendly representation of the
   value
5. add groupLabel prop
6. add chipLabel prop - for cases where it differs from the label prop
   (main use case are tag items)