With the support of null value entires for numeric,string (
OPT-3676) and boolean variable ( OPT-3675) types as well as the dedicated data variable filter include/ExcludeNull flags ( OPT-3677) we can remove the global include/Exclude null flags.
- filterForUndefined & excludeUndefined flags on the variable filter are removed
- existing filterForUndefined usage is migrated to use the new equivalent
- API docs are updated